adding recipe for creating apache pacemaker primitive

(to be reusable from other barclamps)
* Please can you change the example to use real world port numbers? It is much clearer that way.
* AFAICS you didn't address my concern about `crowbar_defined_ports.values` having a non-deterministic order.  Why is it OK for `listening_port` to be a semi-randomly selected value? Changing the inner array to a hash is fine to me, but it does not seem right to rely on the ordering of the outer structure when it's a hash.