Comment 2 for bug 1560807

Reviewed: https://review.openstack.org/296220
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=bac0d4e550c0a1a9cef6befc9171c9d85cb0ac39
Submitter: Jenkins
Branch: master

commit bac0d4e550c0a1a9cef6befc9171c9d85cb0ac39
Author: zhangsong <email address hidden>
Date: Wed Mar 23 14:39:56 2016 +0800

    Sheepdog:make full use of all sheepdog nodes

    The sheepdog driver of cinder should use a policy to make full
    use of all sheepdog nodes of a cluster instead of single node.
    It can solve single point of failure and hot spot problem.

    This patch uses random method. When it needs to run a dog command
    or provide a location path to qemu, it gets a random node from all
    sheepdog nodes of a cluster.

    Change-Id: I0280b71203d99829796244afbd9a8f308b7e910a
    Closes-Bug: #1560807