Fix jdbc-jc to work with tomcat gradle plugin

It is necessary to ensure that src/main/webapp exists to ensure the
application starts with the Tomcat Gradle Plugin.

This commit adds a Manifest file to src/main/webapp/META-INF to ensure
that git contains the otherwise empty directory.
SEC-2647: IntelliJ testSourceDirs
SEC-2618: LdapAuthenticationProviderConfigurer passwordAttribute null check

If LdapAuthenticationProviderConfigurer passwordAttribute is null, do not
set on the PasswordComparisonAuthenticator
SEC-2657: LdapAuthenticationProviderConfigurer find available port
SEC-2658: Java Config triggers usePasswordAttrCompare to be set
SEC-2659: ApacheDSContainer fails on import multiple ldif
SEC-2660: Move config integration-test *.groovy to groovy source folder
SEC-2657: Test for multi dynamic ports for LDAP Java Config
Next development version ldap/pom.xml