TRQ-1790 and TRQ-1629. Make the mother superior retry join job requests to other moms after 5 minutes by default - settable using $resend_join_job_wait_time. Also, make the mother superior consider that the job will never start and abort it after 10 minutes by default. This time is also settable using $max_join_job_wait_time. Both of these are parameters for the mom's config file.