tests: Use swaks instead of nc for sending mail (#3732)

See associated `CHANGELOG.md` entry for details.

---------

Co-authored-by: Brennan Kinney <5098581+polarathene@users.noreply.github.com>

test/files/ssl/example.test/with_ca/ecdsa/ca-cert.ecdsa.pem

@@ -0,0 +1,10 @@
+-----BEGIN CERTIFICATE-----
+MIIBejCCASGgAwIBAgIQRRIFsycc6tiFqOqcXCHZvDAKBggqhkjOPQQDAjAcMRow
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+VgK8orKZ5I0QetVzAiByJWS2HKqmwxThZjW/oduQ6klZ+UToY96owLubIQhZhw==
+-----END CERTIFICATE-----

test/files/ssl/example.test/with_ca/ecdsa/ca-key.ecdsa.pem

@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIJH8zwg9RIU/CowHtUHTDPe19w740Mqh+BYcFCoqAO4noAoGCCqGSM49
+AwEHoUQDQgAEz2IxYBk9cnhgWR4nE93P2RE2KDKv+ijkDm6rS62iSQDcbIkJmPr3
+8o3tUFPbz21Pzp0aYZfFgHJeJjRKu8uBjA==
+-----END EC PRIVATE KEY-----

test/files/ssl/example.test/with_ca/ecdsa/cert.ecdsa.pem

@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----
+MIIBxTCCAWqgAwIBAgIQHg296UPzq0FEkJdEzVjrSjAKBggqhkjOPQQDAjAcMRow
+GAYDVQQDExFTbWFsbHN0ZXAgUm9vdCBDQTAeFw0yMTAxMDEwMDAwMDBaFw0zMTAx
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+23e5VwfmuVo9ADTT9esYZ5u6v4hicunJmQ==
+-----END CERTIFICATE-----

test/files/ssl/example.test/with_ca/ecdsa/cert.rsa.pem

@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE-----
+MIICijCCAjGgAwIBAgIRAPXENYk0OaCer/5wnuExtNswCgYIKoZIzj0EAwIwHDEa
+MBgGA1UEAxMRU21hbGxzdGVwIFJvb3QgQ0EwHhcNMjEwMTAxMDAwMDAwWhcNMzEw
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+KQ9KnNpcqGcr70qOFxtaGZ/cDGf9BwzoWT7fS/8r
+-----END CERTIFICATE-----

test/files/ssl/example.test/with_ca/ecdsa/ecdsa.acme.json

@@ -0,0 +1,29 @@
+{
+    "le": {
+      "Account": {
+        "Email": "acme@example.test",
+        "Registration": {
+          "body": {
+            "status": "valid",
+            "contact": [
+              "mailto:acme@example.test"
+            ]
+          },
+          "uri": "https://acme-v02.api.letsencrypt.org/acme/acct/0123456789"
+        },
+        "PrivateKey": "x",
+        "KeyType": "EC256"
+      },
+      "Certificates": [
+        {
+          "domain": {
+            "main": "Smallstep Leaf",
+            "sans": ["mail.example.test"]
+          },
+          "certificate": "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",
+          "key": "LS0tLS1CRUdJTiBFQyBQUklWQVRFIEtFWS0tLS0tCk1IY0NBUUVFSU1sOWx2c2lTV1VxQ1ErY3ZYZGlNQXBmVmhRL1hIOHp1aU5oRkQzSmJHdjlvQW9HQ0NxR1NNNDkKQXdFSG9VUURRZ0FFOUZzQWFtcktIYmdWZ0lIUWduSytyem84WHFlYlpDRVdHU2Z6ZFF2cjRQNUhhbXllMTlxQQpEaHNKZGtYK2kvMTVDZmNJSWhxVElDRjBYbmlSVTBXZWNRPT0KLS0tLS1FTkQgRUMgUFJJVkFURSBLRVktLS0tLQo=",
+          "Store": "default"
+        }
+      ]
+    }
+  }

test/files/ssl/example.test/with_ca/ecdsa/key.ecdsa.pem

@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIMl9lvsiSWUqCQ+cvXdiMApfVhQ/XH8zuiNhFD3JbGv9oAoGCCqGSM49
+AwEHoUQDQgAE9FsAamrKHbgVgIHQgnK+rzo8XqebZCEWGSfzdQvr4P5Hamye19qA
+DhsJdkX+i/15CfcIIhqTICF0XniRU0WecQ==
+-----END EC PRIVATE KEY-----

test/files/ssl/example.test/with_ca/ecdsa/key.rsa.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEogIBAAKCAQEAsZGp1MnoZHWF4+sFbrhHR+5kvEGIgq1OdQbtQqXxaFC4FSu9
+30Rmldd+325n9AhmRzGh6HMZi7KwohKZaVDqMN+CUo2Bv8EUL1kER+WV1ws+oZxE
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++xaGoYELtYQO2uD4220NJG+ibf40eV64IixsyYjvMsFCPERG+Ff2TjViS6RrgvsI
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+/6E/fQuzv7/7auiUy2HM0QHjzKjNzZDshM2DegPR5C6kn/LsDwYz9u5Tq7huk8L3
+5HpxnIhEoy4mQydLuXEu4ZNGprME1giiCG2tTH3o1CjsmuVAnuQ=
+-----END RSA PRIVATE KEY-----

test/files/ssl/example.test/with_ca/ecdsa/rsa.acme.json

@@ -0,0 +1,29 @@
+{
+    "le": {
+      "Account": {
+        "Email": "acme@example.test",
+        "Registration": {
+          "body": {
+            "status": "valid",
+            "contact": [
+              "mailto:acme@example.test"
+            ]
+          },
+          "uri": "https://acme-v02.api.letsencrypt.org/acme/acct/0123456789"
+        },
+        "PrivateKey": "x",
+        "KeyType": "RSA2048"
+      },
+      "Certificates": [
+        {
+          "domain": {
+            "main": "Smallstep Leaf",
+            "sans": ["example.test"]
+          },
+          "certificate": "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",
+          "key": "LS0tLS1CRUdJTiBSU0EgUFJJVkFURSBLRVktLS0tLQpNSUlFb2dJQkFBS0NBUUVBc1pHcDFNbm9aSFdGNCtzRmJyaEhSKzVrdkVHSWdxMU9kUWJ0UXFYeGFGQzRGU3U5CjMwUm1sZGQrMzI1bjlBaG1SekdoNkhNWmk3S3dvaEtaYVZEcU1OK0NVbzJCdjhFVUwxa0VSK1dWMXdzK29aeEUKNVd3M1B5RlBlN1FBdkVBRTBCS2pMTy9odjR5WGkrK2dVTE8xcFp2b3JPUUIyeGFXT1kzMmp3WldLWHZXK1VqdwpXNDg3L0w3b1ErbENSYThNKzB3SjV5SzhFQW12TmV3b3ZwbVVkTUZBS2hjS0h5T3kvcTkzNG1UTkhzZ0NjbjV6Cm5pUkdURzRmMWNQS0JWaVptRWdtMFUxNHh6bS9hSllHSmR3czkwN2c0Z2dHeVJrVXIvM2ZwYUxPeXM5K3JaYzgKcnp0dUhCeEJFRTJLNzVDQ21xRDcyT3pReE1qdXNGQzA1L3JkK3dJREFRQUJBb0lCQUdDeDJiR3VZWWFUR040TQpWV0Q5cUpOYkZqQU4zN0NKZjNmcTFiaTlkTUJCZEh6UzNRcC96UDA3NURMM2hGUTNYcnJXSkR6WXNNaUovZlhECit4YUdvWUVMdFlRTzJ1RDQyMjBOSkcraWJmNDBlVjY0SWl4c3lZanZNc0ZDUEVSRytGZjJUalZpUzZScmd2c0kKK2x2NEFLcTJRL1lpRTRDaXhCdURXd2gzZ3VRRFM4d2lmV2s2dndjREkzQU5tcHIwdkRWWVhqRVk3a3hCc3BadwpYRzVUdHJldEJISUhRR0ZiQlZiUy9sMG9mVmxiblFoN3lMbjZBeFVaY1ZXSGlUY2h0UXgxdEw5NVFVL0gzb01uCmlMM21NTEFTV3Z3L3JMaldDTEREeTR1T2o4VVdmaVZxcVB4eEZjb3lxeTRCS3VsNWd0eWJsQjlMLzVBNUk1aTAKZmVGVzFnRUNnWUVBMThGaENZbGJ2N3dvZXQ5a096NHpZMit3Q1BlNWx6dUlwMXQvamZ3QWZydHZ6Ny9UVlV0dgptQVlERFZmT1p2WlhtUksxbng5RXYrTTJPYjcxc0RzUlhjOHpKa2ZmejQyZUtTYVNSQkUyOVRVemw3T3lvbmQwCllNanpYZXJYS0ZKd3ZJY25aeWNoQ3V4L2RKV3VNUE53YnZLOThYblF2blJGdFJ5Wm9iMmFWbUVDZ1lFQTByRFUKdVRyUXFoZGVacGtpcGZ3dXhVNHNYSzl1YllCUmhlNEhlQ3BvblZ4VFhGWTF6VFkyR0RRZmpacHZMNjlubGU4UwpjcXNLZUpaWlR3NU9RTktGV2xQK2ppK3d6QnZDS2FsUzdGWFlBOGRkUWhNNmFkTUhrWHE0bGU4c2pVQmZwMFB0CmRzc2RoeFlTaEVoRGVEVmRjdTR5T25ESW85K0RtV1lYcW9Jem1kc0NnWUJJOHpLck5jMVcyL2pYNnRhS0RYTDAKcVJ2ZFBGMTlHLzBOa1N0a3g1TW5ScHI4cElDQk0zdHM3SU4xckgyMlpJNmp6Q2Fxd2JqT0pMWDkrbW82Qnc3TgpLRFRFT2NNYisyZEJ4Sy9wNGVReUxxWGVJajFCSDZDeTVOOGNuejNXZldGdTdVZk9ZZldUS3ZuQllxYStHR0dvCnNkeTFYQm5QZTZMaUpPUnhRcGwvb1FLQmdEeVpnL1hyQnMyRmZ5OS9hRW5acVJJekUrdHN3aFJZemhuNWhzaDMKV2pPNHRIbGdpb1VGekxWVmVLWGYvNDcxb3BPcmVlRGxkVk9OMnc0MERTbno0MHRCMFh2UUY4ZjlTL0Z6dEZncApzTUlWZTZ0Zm9IT0RzUytVM3JheFhsMGFZT2paVHRuV1BoMzJxVWpIQ0REeEdIblFMVDVGNWsvTUlDdmxBM1dWCmtZWDFBb0dBY2RjdHdOSzFoelpOdFp3bWtBS3RtaXpSR0FJNEhxNHRSb0JxU3ZyQ3o1OUJDWTEvVm5ZWllXVHoKLzZFL2ZRdXp2Ny83YXVpVXkySE0wUUhqektqTnpaRHNoTTJEZWdQUjVDNmtuL0xzRHdZejl1NVRxN2h1azhMMwo1SHB4bkloRW95NG1ReWRMdVhFdTRaTkdwck1FMWdpaUNHMnRUSDNvMUNqc211VkFudVE9Ci0tLS0tRU5EIFJTQSBQUklWQVRFIEtFWS0tLS0tCg==",
+          "Store": "default"
+        }
+      ]
+    }
+  }

test/files/ssl/example.test/with_ca/ecdsa/wildcard/cert.ecdsa.pem

@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

test/files/ssl/example.test/with_ca/ecdsa/wildcard/ecdsa.acme.json

@@ -0,0 +1,29 @@
+{
+    "le": {
+      "Account": {
+        "Email": "acme@example.test",
+        "Registration": {
+          "body": {
+            "status": "valid",
+            "contact": [
+              "mailto:acme@example.test"
+            ]
+          },
+          "uri": "https://acme-v02.api.letsencrypt.org/acme/acct/0123456789"
+        },
+        "PrivateKey": "x",
+        "KeyType": "EC256"
+      },
+      "Certificates": [
+        {
+          "domain": {
+            "main": "Smallstep Leaf",
+            "sans": ["*.example.test"]
+          },
+          "certificate": "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",
+          "key": "LS0tLS1CRUdJTiBFQyBQUklWQVRFIEtFWS0tLS0tCk1IY0NBUUVFSUNSSk9mUGVPSVVvNXl3RW52S0R6dkVJMUtQejV2ZjFrNno5bUN0MlBwYzlvQW9HQ0NxR1NNNDkKQXdFSG9VUURRZ0FFTDBSekZPVG9tb2lobG9LKzgrV0xsS1NLN0JqQmM0YlBGWXJvQmIxR2NjK2h2VGFFMExpegpGZlJ6NGxPSERjM29wVUthbEpIWW85VGgwWGRheTlxSjZnPT0KLS0tLS1FTkQgRUMgUFJJVkFURSBLRVktLS0tLQo=",
+          "Store": "default"
+        }
+      ]
+    }
+  }

test/files/ssl/example.test/with_ca/ecdsa/wildcard/key.ecdsa.pem

@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEICRJOfPeOIUo5ywEnvKDzvEI1KPz5vf1k6z9mCt2Ppc9oAoGCCqGSM49
+AwEHoUQDQgAEL0RzFOTomoihloK+8+WLlKSK7BjBc4bPFYroBb1Gcc+hvTaE0Liz
+FfRz4lOHDc3opUKalJHYo9Th0Xday9qJ6g==
+-----END EC PRIVATE KEY-----