Allow user to disable VIP ping resource

https://review.openstack.org/138446
commit c37df6f80484dd140571867fa218677e036b0d07
Author: Vladimir Kuklin <email address hidden>
Date: Tue Dec 2 20:20:26 2014 +0300

    Allow user to disable VIP ping resource

    Allow user to disable VIP ping resource
    if user does not need public network
    to be routable.

    Since 5.1.1 and 6.0 releases FUEL configures ping resource that checks whether default gateway is accessible in order to fix the corresponding bug:

    https://bugs.launchpad.net/fuel/+bug/1370510

    Nevertheless, this fix imposes the issue that if user does not have pingable default gateway, deployment of OpenStack cluster will fail as FUEL uses public VIP to configure some of OpenStack entities (e.g. floating ip pools). In order to work this around, user can specify any pingable host as a default gateway, e.g. FUEL master node or apply the patch above and change cluster attribute 'run_ping_checker' to 'false' that will disable the pinger resource. In order to do this user will need to use FUEL CLI and add this parameter manually to the deployment cluster attributes.

    Also, be aware that disabling of pinger will introduce back the corresponding bug https://bugs.launchpad.net/fuel/+bug/1370510

    DocImpact
    Change-Id: I9e1f29b5ee08ec7276175de213dcdae392251045
    Related-bug: #1396126