Changed MongoDB connect to use connect string giving flexibility to connect to remote host, specify port, etc.  Also, MongoDB authenticate function has been deprecated.

Also added <PASSTHRU> mode for specifying FIND condition.  MongoDB is NotSQL, so trying to convert where clause to MongoDB Find JSON string, accounting for all of
MongoDB's syntax will be too complex.  Also <PASSTHRU> mode allowed user to specify number literals and use the exact same Find JSON string used in Mongo.

Change-Id: I21a4ca2f85efce3799541f5427efc97ac719cb84