Revert "Ignore heartbeats lock fails"

It seems that there are at least two level of ruby-stomp brokenness and
the fact that the mutex in original commit is locked actually means
there is no heartbeat received in time and we need to do something about
this.

This reverts commit 8318d70565.

Partial-Bug: #1644618
Change-Id: I565f430d17bcee2c50c0ddc8ecc11f3dc8b420ed
(cherry picked from commit 13b4d0f38e)

deployment/puppet/fuel/manifests/mcollective.pp

@@ -38,9 +38,6 @@ class fuel::mcollective(
     },
     'plugin.rabbitmq.heartbeat_interval' => {
       value => '30'
-    },
-    'plugin.rabbitmq.max_hbrlck_fails' => {
-      value => '0'
     }
   }