core: Do not allow non monitored commands to send JobId or StepId parameters

Change-Id: I769ac4c624c4a5fa850b51600c49aaed06a7443b
Signed-off-by: Eli Mesika <emesika@redhat.com>
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=872719