srun would not return an exit code if a previous task exited before a
latter task exited with a signal.

If multiple tasks exit with a signal, srun returns the highest signal.

Partially reverts commit 04b449e1 -- the setting of local_global_rc
to NO_VAL as srun doesn't need to know whether it's been set or not
anymore. srun always sets the signal if a task exited with a signal.

Bug 5083

Avoid left-over test input file

src/plugins/ and src/common/assoc_mgr.c are still left to convert.

No functional change.

Bug 4999.

There were two code paths building an allocation response by calling
its own static _build_alloc_msg() function:

1. src/slurmctld/proc_req.c
2. src/slurmctld/srun_comm.c

These two functions diverged and both had members that were not filled
in but were filled in the other. This patch makes it so we change the
signature of the one in proc_req.c to make it extern and then in
srun_comm.c we call this newly common function.

Also added cpu_freq_[min|max|gov] members in the common one since these
were the only members missing in proc_req.c function (the one in
srun_comm.c had more members missing, like all the ntasks_per*, account,
qos or resv_name).

Bug 4999.

Update slurm.spec and slurm.spec-legacy as well

Only trust MUNGE signed values, unless the RPC was signed by
SlurmUser or root.

CVE-2018-10995.

Already vetted by slurmctld/slurmd, no need to re-check here.

Do not defer until later, and do not potentially miss out on proper
validation of the user_name field which can lead to improper authentication
handling.

CVE-2018-10995.

If the auth value (from MUNGE) does not match the requested value,
ensure it is listed as a valid extended gid for that user instead.

Bug 5038.

Value of 2113 is where it fits in with 17.11, so pin it here.