Use queue_creation to send queue's metadata

Since v1.1, the queue metadata is part of the queue endpoint. It has to
be set/updated by using the queue endpoint. The old set_metadata and
get_metadata endpoitns have been removed.

Partially-Implements blueprint: api-v1.1

Change-Id: I7b5b50529c4591701c62a1fa92dddbae9add6265