WFLY-1786 Return the correct http and https ports taking into account the port-offset

The commit here fixes the issue reported in https://issues.jboss.org/browse/WFLY-1786 where the port-offset wasn't taken into account while handing out the port numbers to WebServices integration layer (in particular).


P.S: After this commit, manual fiddling with port-offset and running an existing testcase SimpleWebserviceEndpointTestCase gets it to pass