Add pacemaker wrapper

This is a wrapper to ensure a check script is started only if a
pacemaker resource run on the checked host.

example:

  pacemaker_host_check.py -r ceilometer-agent-central
      -s ../ceilometer/check_amqp_ceilometer-agent-central.py
Fix process name detection

Do exacts match for the binary/script when we do
process dectection to avoid matching:

  python check_amqp_ceilometer-agent-central.py

when we want catch:

 python ceilometer-agent-central