Added a Fixture method to check if journaling is enabled on the server
JAVA-1131: Checking for jnote and wnote in GLE response, and throwing a CommandFailureException if either is non-null.
JAVA-1040: Added more bulk write test coverage for write concern edge cases
JAVA-1128: Don't apply key checking for inserts into system.indexes
JAVA-1128: Ensure that _id is generated for inserted documents in all cases