MongoDB 3.0 driver.

Created tests for the basic DB operations.

Updated MongoDB Inc. Driver version to 3.0.2.

to the 3.0 driver from MongoDB Inc. and updated to the new Document and
fluent APIs.

URI to configure the client. Old properties are deprecated and but will
be added to the URI if present and the URI does not already contain a
value for the setting.

When running workloads that use the "insert" operation, we get a lot of
duplicate key exceptions from the server. Changing to upsert to avoid
these exceptions.

No need to call getError on writeResult. any errors for writeConcern level will throw exceptions and be caught in catch block

each test client.

Add a control (via properties) for the number of connections the Mongo
instance will create/use.