vim monitor using rpc

[OpenStack Infra]

https://review.openstack.org/475207
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 60187643b586568e9c6f51c45d8b91ab697ed3fc
Author: jing.liuqing <[e-mail]>
Date: Mon Jun 19 11:19:00 2017 +0800

    vim monitor using rpc

    This patch sets up the rpc queue named KILL_ACTION.<vim_id>
    in mistral action class. When vim is deleted, the tacker server
    will send(cast) kill message to the mistral task, which will exit.

    To test it:
    1. python setup.py develop
    2. mistral-db-manage --config-file /etc/mistral/mistral.conf
    populate
    3. restart mistral related service and tacker service
    4. tacker vim-register to register a vim
    5. mistral workflow-list to check if the monitor workflow is
    started
    6. tacker vim-delete to check if the workflow and task is deleted

    DocImpact
    Implements: blueprint refactor-vim-monitor

    Change-Id: I078917af65e57305c06b4605835c9d0d3dc1cf68