re-stack with redis failed. unstack doesn't kill redis-server

[Omer Anson]

When using df-redis-server, running stack, unstack, stack, fails.

When using df-redis-server, stack creates redis server nodes. unstack should remove them. The next stack should create them anew. However, unstack doesn't remove the servers, and therefore stack fails when trying to create them anew.

[Omer Anson (omer-anson)]

Set to low for the following reasons:
1. Only affects devstack and developers
2. Workaround exists: After unstack, run: killall -9 redis-server.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/490452
Committed: https://git.openstack.org/cgit/openstack/dragonflow/commit/?id=9373238dab9a43bec01c99e986d977069e12eb30
Submitter: Jenkins
Branch: master

commit 9373238dab9a43bec01c99e986d977069e12eb30
Author: Dima Kuznetsov <email address hidden>
Date: Thu Aug 3 15:10:18 2017 +0300

    Devstack: fix redis unstack shutdown

    [1] moved REMOTE_DB_IP definition to after sourcing redis_driver. This
    causes REDIS_SERVER_LIST to be initialized incorrectly

    [1] - https://review.openstack.org/#/c/476401/

    Change-Id: Ifb705e3ded209603813a61e4d40be126ab7fc971
    Closes-Bug: #1706862