Test applying legacy one-off patches to Galleon-slimmed installations

An installation that has been slimmed by Galleon should still be able to handle one-off patches provided by the legacy patching tool, so long as the necessary management layers are present and the org.jboss.as.patching[.cli] packages are present.

Task is to add tests confirming this.

My plan is to provision such an installation in testsuite/patching and then add a surefire execution that runs BasicOneOffPatchingScenariosTestCase against that installation.