Extend fencing to hosts using fence_kubevirt agent.
Extend fencing to hosts using fence_kubevirt agent.

This commit extends the fencing class allowing operators to use
fence_kubevirt for nodes running on kubevirt / CNV.

Depends-On: I18fd2297063c7157d6b743c7fc9c161bf23dca39
Change-Id: I4f4658b3320c2cce2cf302dbb5f99bb463bd22ca

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