Add support for fence_ironic fencing agent.
Add support for fence_ironic fencing agent.

We now support creating Pacemaker stonith fencing using the fence_ironic
fencing agent.

Partial-Bug: #1649695

Depends-On: I315f9bb78a1296f691dadaeb39fb0a48df1d5f06
Change-Id: I596eef68820f16516feeda147d3689f0da85d7ac

openstack/puppet-tripleo,openstack/puppet-tripleo,openstack/puppet-tripleo