Improve monitoring in neutron-agent-dhcp OCF

* Added OCF_RESKEY_amqp_server_port parameter to neoutron-agent-dhcp OCF
  script
* Monitoring function monitors the connections to AMQP. Pacemaker will
  restart the service in case of problems with AMQP.

Change-Id: I5ee58d8268ae0d41322b53768b13ef2eb6522ead
Implements: bp/pacemaker-improvements
Merge "Improve monitoring in neutron-agent-dhcp OCF"