Ticket 52 - ns_job_modify should not rearm
    
    Bug Description:  ns_job_modify would automatically rearm, which violates
    the principal of least surprise.
    
    A consumer may wish to modify the job one or more times, *then* explicitly call
    the rearm.
    
    Fix Description:  remove the rearm from ns_job_modify. Move the logic from the
    rearm to ns_job_rearm
    
    https://fedorahosted.org/nunc-stans/ticket/52
    
    Author: wibrown
    
    Review by: nhosoi (Thanks)