[WFCORE-353] : CLI command for executing the deployment scanner.

Adding a new operation that will run a single scan.

Jira: https://issues.jboss.org/browse/WFCORE-353
This needs to be context.getServiceRegistry(true).

* @param modify {@code true} if the operation may be modifying a service, {@code false} otherwise

The meaning of "modify a service" is meant to be extremely broad. In this case you may end up adding new services.