introduce tacker conductor

[OpenStack Infra]

https://review.openstack.org/472149
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
Your project "openstack/tacker" is set up so that we directly report the documentation bugs against it. If this needs changing, the docimpact-group option needs to be added for the project. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit e58b01a545eb232fc1094fe1ace0b52cfda6cdcb
Author: jing.liuqing <[e-mail]>
Date: Thu Jun 8 16:20:19 2017 +0800

    introduce tacker conductor

    This patch enables the message rpc framework which tacker conductor
    will use. After started via tacker_conductor script, it will listen
    on tacker_conductor, tacker_conductor.<host> and one fanout queues.

    These three queues are intialized in oslo service module. And topic
    queue tacker_conductor will be used by mistral actions.

    How to test it:
      document will be written after the whole vim monitor is ready.
    To test this patch, after 'python setup.py develop', run
    'tacker-conductor --config-file /etc/tacker/tacker.conf', and then
    use 'rabbitmqctl list_queues' which will list three queues starting
    with 'tacker_conductor'.

    DocImpact
    Implements: blueprint refactor-vim-monitor

    Change-Id: Ide80674099d384aed1a98b22928e9fc6bcfa3ff9