tests: Change OpenLDAP image to bitnami/openldap (#3494)

**TL;DR:**
- New image is actively maintained vs existing one that is over 5 years old. 
- Slight improvement to LDAP tree config via `.ldif` files.
- No more `Dockerfile` required to build, we can just rely on `docker run`.

`osixia/openldap` has not seen any activity since Feb 2021, while our `Dockerfile` was fixed to v1.1.6` (Feb 2018).

Startup time for this new image is around 5 seconds? (_The LDAP test uses a standard 20 second timeout check to wait until the server is ready before continuing with starting the DMS image_).

This commit migrates to `bitnami/openldap` which required modifying the `01_mail-tree.ldif` to also include adding the root object to start successfully. This image is actively maintained and one of the most popular OpenLDAP images on DockerHub.

The user account `.ldif` files have minimal changes:
- Lines moved around for better organization
- Additional comments for context
- Removal of inherited `objectClass` attributes (`person`, `top`) from the `orgnizationalPerson` class. Attribute `sn` changed to long form `surname` and values corrected with `givenName`. `changetype: add` was also not necessary.

Additionally the image does not support the `.schema` format, they must be converted to `.ldif` which has been done for `postfix-book.schema`.

See PR for more details.

test/config/ldap/docker-openldap/bootstrap/ldif/01_mail-tree.ldif

@@ -1,5 +1,11 @@
+# The root object, all entries will branch off this one:
+dn: dc=localhost,dc=localdomain
+objectClass: dcObject
+objectClass: organization
+dc: localhost
+o: DMS Test
+
+# User accounts will belong to this subtree:
 dn: ou=people,dc=localhost,dc=localdomain
-changetype: add
 objectClass: organizationalUnit
-objectClass: top
 ou: people

test/config/ldap/docker-openldap/bootstrap/ldif/02_user-email.ldif

@@ -1,25 +1,22 @@
-# --------------------------------------------------------------------
-# Create mail accounts
-# --------------------------------------------------------------------
-# Some User
+# NOTE: A standard user account to test against
 dn: uniqueIdentifier=some.user,ou=people,dc=localhost,dc=localdomain
-changetype: add
 objectClass: organizationalPerson
-objectClass: person
-objectClass: top
 objectClass: PostfixBookMailAccount
 objectClass: extensibleObject
 cn: Some User
-givenName: User
+givenName: Some
+surname: User
+uniqueIdentifier: some.user
+# Password is: secret
+userPassword: {SSHA}eLtqGpid+hkSVhxvsdTPztv4uapRofGx
 mail: some.user@localhost.localdomain
+# postfix-book.schema:
 mailAlias: postmaster@localhost.localdomain
 mailGroupMember: employees@localhost.localdomain
-mailEnabled: TRUE
-mailGidNumber: 5000
 mailHomeDirectory: /var/mail/localhost.localdomain/some.user/
-mailQuota: 10240
 mailStorageDirectory: maildir:/var/mail/localhost.localdomain/some.user/
+# postfix-book.schema generic options:
+mailEnabled: TRUE
 mailUidNumber: 5000
-sn: Some
-uniqueIdentifier: some.user
-userPassword: {SSHA}eLtqGpid+hkSVhxvsdTPztv4uapRofGx
+mailGidNumber: 5000
+mailQuota: 10240

test/config/ldap/docker-openldap/bootstrap/ldif/03_user-email-other-primary-domain.ldif

@@ -1,25 +1,23 @@
-# --------------------------------------------------------------------
-# Create mail accounts
-# --------------------------------------------------------------------
-# Some User
+# NOTE: This user differs via the domain-part of their mail address
+# They also have their mail directory attributes using the primary domain, not their domain-part
 dn: uniqueIdentifier=some.other.user,ou=people,dc=localhost,dc=localdomain
-changetype: add
 objectClass: organizationalPerson
-objectClass: person
-objectClass: top
 objectClass: PostfixBookMailAccount
 objectClass: extensibleObject
 cn: Some Other User
-givenName: Other User
+givenName: Some
+surname: Other User
+uniqueIdentifier: some.other.user
+# Password is: secret
+userPassword: {SSHA}eLtqGpid+hkSVhxvsdTPztv4uapRofGx
 mail: some.other.user@localhost.otherdomain
+# postfix-book.schema:
 mailAlias: postmaster@localhost.otherdomain
 mailGroupMember: employees@localhost.otherdomain
-mailEnabled: TRUE
-mailGidNumber: 5000
 mailHomeDirectory: /var/mail/localhost.localdomain/some.other.user/
-mailQuota: 10240
 mailStorageDirectory: maildir:/var/mail/localhost.localdomain/some.other.user/
+# postfix-book.schema generic options:
+mailEnabled: TRUE
 mailUidNumber: 5000
-sn: Some
-uniqueIdentifier: some.other.user
-userPassword: {SSHA}eLtqGpid+hkSVhxvsdTPztv4uapRofGx
+mailGidNumber: 5000
+mailQuota: 10240

test/config/ldap/docker-openldap/bootstrap/ldif/04_user-email-different-uid.ldif

@@ -1,23 +1,21 @@
-# --------------------------------------------------------------------
-# Create mail accounts
-# --------------------------------------------------------------------
-# Some User
+# NOTE: This user differs by local-part of mail address not matching their uniqueIdentifier attribute
+# They also do not have any alias or groups configured
 dn: uniqueIdentifier=some.user.id,ou=people,dc=localhost,dc=localdomain
-changetype: add
 objectClass: organizationalPerson
-objectClass: person
-objectClass: top
 objectClass: PostfixBookMailAccount
 objectClass: extensibleObject
 cn: Some User
-givenName: User
-mail: some.user.email@localhost.localdomain
-mailEnabled: TRUE
-mailGidNumber: 5000
-mailHomeDirectory: /var/mail/localhost.localdomain/some.user.id/
-mailQuota: 10240
-mailStorageDirectory: maildir:/var/mail/localhost.localdomain/some.user.id/
-mailUidNumber: 5000
-sn: Some
+givenName: Some
+surname: User
 uniqueIdentifier: some.user.id
+# Password is: secret
 userPassword: {SSHA}eLtqGpid+hkSVhxvsdTPztv4uapRofGx
+mail: some.user.email@localhost.localdomain
+# postfix-book.schema:
+mailHomeDirectory: /var/mail/localhost.localdomain/some.user.id/
+mailStorageDirectory: maildir:/var/mail/localhost.localdomain/some.user.id/
+# postfix-book.schema generic options:
+mailEnabled: TRUE
+mailUidNumber: 5000
+mailGidNumber: 5000
+mailQuota: 10240