remove ending message for rpc reply

Registered by Mehdi Abaakouk on 2015-05-07

  At the moment for each msg_id we receive two amqp messages - first one
  with the payload, a second one to ensure the other have finish to send
  the payload. This was made, because a long time ago 'reply' allowed
  generator as payload to send multiple messages on one 'rpc.call' - [1]

  It's a bad idea - to double RPC messages for each call, so we are going
  to remove this the second AMQP message sending.

  [1] - https://github.com/openstack/oslo-incubator/blob/stable/icehouse/openstack/common/rpc/amqp.py#L464

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Viktor Serhieiev
Direction:
Needs approval
Assignee:
Viktor Serhieiev
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

Related branches

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Gerrit topic: https://review.openstack.org/#q,topic:bp/remove-double-reply,n,z

Addressed by: https://review.openstack.org/180542
    Allow to remove second _send_reply() call

Addressed by: https://review.openstack.org/180583
    Refactor processing reply in ReplyWaiter

Addressed by: https://review.openstack.org/185853
    rabbit: test for new reply behavior

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