Mixed domain tests

1)Make it possible to test other distributions than jboss-as-xxx, e.g. wildfly-xxx and jboss-eap-xxx.

2)Get the mixed domain tests working for 7.1.x slaves, some updates to transformers to make that happen. 
a) The domain level core-service=management is discarded when pushing to old slaves, since this was introduced in 8.0.0. Rejecting that would effectively mean it is impossible to have a 8.0.0 DC using access control managing older slaves.
b) Remoting needs to reject the http connector

3)Simplified the mixed-domain test domain.xml, it now has a full-ha profile which is not used on the old slaves. The slaves belong to server groups referencing a profile based on full-ha, with necessary adjustments to be able to boot.

I have updated this with some commits to get the subsystem testing framework working for a 7.2.0 legacy controller, and mixed domain tests for a 7.2.0 slave.