packaging: Disable provisioning when using remote DB

When engine-setup generates an answer-file and the user asks to use a
remote DB, the setup should disable provisioning in the answer file, so
running setup again with the created answer-file, it won't ask the user
database related questions.

Change-Id: I0dace423dbdb24a23ab189b039e39f93b3be6853
Bug-Url: https://bugzilla.redhat.com/1059358
Signed-off-by: Ofer Schreiber <oschreib@redhat.com>