WF-CORE 75: Remove need for native-interface on the Host Controller

Jira: https://issues.jboss.org/browse/WFCORE-75
This is a 3 commits PR : 
 * the first part is about enabling HC- DC communication using any of the 3 supported remote procotols
 * the second is about using the management interfaces defined in HC to be passed automatically to the slaves using the ProcessController.
 * the third is about testing
I don't see the point of this whole try/catch block, as the OSHs should have already validated this data.

Really, the StaticDiscoveryConstructor could be StaticDiscovery(Protocol(or String) protocol, String host, Integer port) with null port translated into -1.