More reserved queue attributes

Registered by Feilong Wang

Now zaqar supports metadata/attributes for queue, but for now, we only have one reserved metadata '_flavor' and it would be nice if we can support more built-in/reserved attributes for queue, like MaximumMessageSize and MessageRetentionPeriod(TTL).

Blueprint information

Status:
Started
Approver:
Feilong Wang
Priority:
Medium
Drafter:
Feilong Wang
Direction:
Approved
Assignee:
Feilong Wang
Definition:
Review
Series goal:
None
Implementation:
Good progress
Milestone target:
None
Started by
Feilong Wang

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Gerrit topic: https://review.openstack.org/#q,topic:bp/more-reserved-queue-attributes,n,z

Addressed by: https://review.openstack.org/265723
    Add `_max_message_size` and `_ttl` as reserved queue attributes

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