[WFCORE-275] : Moving some RBAC testing to core.

Using SetupTask to configure rbac extension/subsystem
Using SetupTask to add deploymentScanner extension.
Allowing debug option to be passed to the server in test-runner.

Jira : https://issues.jboss.org/browse/WFCORE-275
I believe so, as the relate to the other separate executions.

We could probably get rid of the separate executions and go with a manual-mode type approach, perhaps with a TestSuite to group together a bunch of tests that can share a server process. But I'm fine with leaving that for later work; my main goal here is to get tests out of full and into core, and keeping for now the same approaches we've had in core is ok with me.