Add httpchk for http services
Add httpchk for http services

The httpchk health check option should help reduce the situtations
where haproxy thinks the service is up but the service is only
listening and not actively serving http requests.

Change-Id: I13cc5dcf2eea53731e756d078586ab9a97340912
Closes-Bug: #1629052

openstack/puppet-tripleo,openstack/puppet-tripleo,openstack/puppet-tripleo