Add dummy stubs to test_ha_cluster_fence_vlan,test_ha_cluster_fence_flat

Add as well dummy stubs for assertFenceRunSuccess, fence_test_wait,
fence_run_tests, get_fence_test_run; run_fence. TODO implementation.

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Add ruby-libvirt to rpm-reqs

ruby-libvirt will be used to query libvirt for fence_virsh data

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Add custom facts for node.uuid, node.virsh_name

These facts will show virsh domain uuid & name for fence_virsh etc, if virtual;
otherwise will show system uuid (dmi.system.uuid), if any.

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Merge branch 'poc_fence'

Conflicts:
	fuelweb_test/integration/test_node_ha_fence.py

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>