[WFLY-2656] Restore support for legacy clustered-cache-ref
[WFLY-561] Fix attributes in config used in mixed-domain tests
[WFLY-2476] Work around instability in 7.1.2 server restart op

Put the test that restarts the server last so any restart issues don't affect other tests.
The whole HC gets restarted at the end of the test class execution, so the server restart
really could be dropped, but I leave it in there so it is still available later.

There's some problem with the restart on 7.1.2, where despite the blocking=true flag the
next test seems to start executing in the middle of the restart.