adding recipe for creating apache pacemaker primitive

(to be reusable from other barclamps)
Or:
```
listening_port = 80
unless crowbar_defined_ports.empty?
  plain_ports = crowbar_defined_ports.values.sort_by{ |k| k[:plain] || [65536] }.first[:plain]
  listening_port = plain_ports.first unless (plain_ports.nil? || plain_ports.empty?)
end
```