Aligned (JE|File)ReplicaDB and their tests for easier comparison with each other.

Ported to FileReplicaDBTest additional checks for PositionStrategy.ON_MATCHING_KEY. These are the same that were previously added to JEReplicaDBTest.

git-svn-id: https://svn.forgerock.org/opendj/trunk@10966 41b1ffd8-f28e-4786-ab96-9950f0a78031