Implement Lazy Create Queue in v1.1 API

This patch allows:
1.Posting a message for queue that does not exist, and creates the queue on the fly
2.Listing messages, Stats from a non-existing queue which gives an empty
  list with a HTTP code of 200

Claim behavior is left unchanged.

Implements : blueprint api-v1.1-lazy-create-queues

Change-Id: Ie8e1b068d78561deaf01ca84e47e506d88422c1e
Merge "Implement Lazy Create Queue in v1.1 API"