Made FindFluentImpl final
MongoCollection improvements
Set default for MapReduce Action and enabled MapReduceAcceptanceTest
Added tests for proper handling of errors with multiple batches
Removed requestStart, requestDone, and requestEnsureConnection in DB class.

  JAVA-1544
Fixed some InsertOperation tests of unacknowledged writes
Normalised SingleConnectionBinding and AsyncSingleConnectionBinding

Put both in driver-core/src/test
JAVA-1547
Fix race condition in test
Added DBCollection apply/doApply to clirrexclude.yml

 JAVA-1538
Added DB requestStart/requestDone/requestEnsureConnection to clirr-exclude.yml

 JAVA-1544
Updating the API to the new API

JAVA-1325