OPENDJ-1206 (CR-4368) Create a new ReplicationBackend/ChangelogBackend to support cn=changelog

Preparation work: ChangeNotificationListener interface only cover a subset of its DirectoryServerPlugin superclass capabilities, so it is redundant.
So I removed ChangeNotificationListener to ease moving persistent searches to the backend.
The two ChangeNotificationListener implementations are now subclasses of InternalDirectoryServerPlugin.
Updated all code after removing ChangeNotificationListener.



ChangeNotificationListener.java: REMOVED



AuthenticatedUsers.java:
Now extends InternalDirectoryServerPlugin instead of implementing ChangeNotificationListener.
Extracted method getNewAuthNDN() + toDN().

CryptoManagerSync.java:
Now extends InternalDirectoryServerPlugin instead of implementing ChangeNotificationListener.
Extracted method getNewAuthNDN() + toDN().



DirectoryServer.java:
Removed references to removed type ChangeNotificationListener.
Be careful with when AuthenticatedUsers is initialized.

DirectoryConfig.java, LocalBackend*Operation.java:
Removed references to removed type ChangeNotificationListener.



CollectionUtils.java: ADDED

TestChangeNotificationListener.java:
Now extends InternalDirectoryServerPlugin instead of implementing ChangeNotificationListener.

AddOperationTestCase.java:
Extracted methods newRawAttributes(), byteStrings(), addSuccess(), addDisconnect(), bind(), writeAddRequest() + used CollectionUtils.
Consequence of the changes to TestChangeNotificationListener.

DeleteOperationTestCase.java:
Consequence of the changes to TestChangeNotificationListener.

ModifyOperationTestCase.java:
Extracted methods newModifications(), newRawModifications() + used CollectionUtils.
Consequence of the changes to TestChangeNotificationListener.