Make sure we create stonith resources before stonith levels

Currently stonith levels kind of work out of pure luck. If puppet
decides to reorder resources stonith levels can fail with:

            "Error: /Stage[main]/Tripleo::Fencing/Pacemaker::Stonith::Level[stonith-1-525400e05b23]/Pcmk_stonith_level[stonith-level-1-$(/usr/sbin/crm_node -n)-stonith-fence_ipmilan-525400e05b23]/ensure: change from absent to present failed: pcs -f /var/lib/pacemaker/cib/puppet-cib-backup20200305-60559-tn9ici create failed: Error: Stonith resource(s) 'stonith-fence_ipmilan-525400e05b23' do not exist, use --force to override"

Nowhere in the code do we mandate that the single stonith resources need
to be created *before* the stonith levels which make use of them.
Let's add a constraint via collectors so we enforce this ordering.

Tested on the environment that was not working and got a correctly
deployed IHA overcloud.

Change-Id: I78cb6ae21366a429b65a8357b3b267a485484a42
Closes-Bug: #1866214
(cherry picked from commit b706f5365a)
(cherry picked from commit dd44d1552b)

manifests/fencing.pp

@@ -142,6 +142,7 @@ class tripleo::fencing(
           tries             => $tries,
           try_sleep         => $try_sleep,
         }
+        Pcmk_stonith<||> -> Pcmk_stonith_level<||>
       }
     }
   }