Script to update users password, made test and updated setup.sh (#413)

* Added script to update users password, made test and updated setup.sh

* Moved update password test to tests.bat

* Fixed test for update password

target/bin/updatemailuser

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+DATABASE=/tmp/docker-mailserver/postfix-accounts.cf
+
+function usage {
+  echo 'Usage: updatemailuser <user@domain.tld> [password]'
+  exit 1
+}
+
+if [ ! -z "$1" ]; then
+  USER=$1
+  if [ -e "$DATABASE" ] && [ -z "$(grep $USER -i $DATABASE)" ]; then
+    echo "User doesn't exist"
+    exit 1
+  fi
+  if [ ! -z "$2" ]; then
+    PASS="$2"
+  else
+    read -s -p "Enter Password: " PASS
+    if [ -z "$PASS" ]; then
+      echo "Password can't be empty"
+      exit 1
+    fi
+  fi
+  ENTRY=$(echo "$USER|$(doveadm pw -s SHA512-CRYPT -u "$USER" -p "$PASS")")
+  sed -i.bak "s%^$USER.*%$ENTRY%g" $DATABASE 
+else
+  usage
+fi