Missed sreport in d3ee28fa

Forgot to add the .h changes.
1d20fe77

because it can't get the fed job lock from the origin cluster.

Only storing existing pointers so don't destroy them.

Only realloc and copy if there is something to copy in.

Coverity CID:169529

The sibling should send its job list even it is empty so that the other
sibling can see if any jobs are missing.

Coverity CID:169530, 169531

In order for scancel -u <user> to be able to cancel jobs by user that
exist only on other clusters in the federation, scancel needs to load
all of them.

Running jobs can happen out of order.

Original list was being free'd before the copy was.

sbatch|srun --test-only
Bug 3740

Bug 3802

Bug 3641

and steps

Bug 3700

Bug 3699

Bug 3698

Bug 3697

Bug 3667

to validate scontrol --local and --sibling options

Bug 3662

Only used in fed_mgr.c

This will make it easier to add new proto types without having to
modifying protocol_defs.[ch].

Leaving job_lock and job_unlock to be handled by slurmctld_req since
they aren't a "queued" type.

prevent possible memory leak.

All handled in _proc_multi_msg except for sib_job_[un]lock.

This prevents deadlocks when having the fed_job_list_mutex locked higher
up and calling job_completion_logger inside of the locked mutex.