Comment 2 for bug 1634573

Reviewed: https://review.openstack.org/397517
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=75b90a5ddb249b8ce9c5dc4a4acf95c3040e76c1
Submitter: Jenkins
Branch: master

commit 75b90a5ddb249b8ce9c5dc4a4acf95c3040e76c1
Author: OctopusZhang <zhang.yufei@99cloud.net>
Date: Tue Nov 15 12:01:44 2016 +0800

    Update multitenancy docs

    Add a warning to remind user to configure provisioning and cleaning
    network as non-shared network.

    Add a note to remind user not to use provision network for instance
    spawning.

    Change-Id: Ifd7218fc24386097ed072195de8712d600399f09
    Related-Bug: #1634573