Previously a killpg was used, now a signal_container call is used and
this might result in the processes being signalled at very slightly
different times, possibly permitting a new process to start

Makes sure that we don't run the multifactor plugin using the
ticket based logic

This appears to have been added by accident

The most significant change is that we don't signal individual processes
unless there are some processes in the step which are currently core
dumping. This change signals the processes closer together in time
when possible.

message.

users.

Processes which can be signalled will be. Others will be signalled
when possible from a pthread.

It is not clear why this RPC exists in the first place. Convert
to use REQUEST_SIGNAL_CONTAINER RPC instead.

Conflicts:
	META
	NEWS
	RELEASE_NOTES

values.

Conflicts:
	src/slurmctld/job_mgr.c

allowed to see their associations.