Removing heartbeat parmameter, so that the default value 60 sec will …

…be used.

If we need to override this value in rabbitmq.config, we also need to set
'rabbit_health_check_interval' in the contrail-api.conf to twice the value of
heartbeat set in rabbitmq.config.

Change-Id: I22fab8a3cc7a0b076ae3f642d16029ba5dab8e2f
Partial-Bug: 1639014

fabfile/templates/rabbitmq_config.py

@@ -6,7 +6,6 @@
               {vm_memory_high_watermark, 0.4},
               {disk_free_limit,50000000},
               {log_levels,[{connection, info},{mirroring, info}]},
-              {heartbeat,10},
               {delegate_count,20},
               {channel_max,5000},
               {tcp_listen_options,