Include queue ID in unclaim to trigger use of index

This patch modifies the MongoDB driver's unclaim() method
for messages so that it includes the queue ID in the
query to the database. This should allow the query
to use an index for the operation.

Change-Id: I6ae5a2f03fafd7f617d4766f3ae08fd822c887ff
Implements: blueprint api-perf-tuning
Fixes: bug #1205388