Make comments conform to Linux standard

bug 4356

Continue to build with OpenSSL by default, which can be disabled
with --without openssl.

No behavioral change.

Bug 4428.

_top_priority() is used to determine at job allocation time (called from
job_allocate()) if any other job has a higher priority than the specified
job being allocated. If so, it sets the job state_reason to WAIT_PRIORITY.
This patch skips the priority comparison if the two jobs being compared
are pack job components from the same heterogeneous job.

Bug 4400.

Global replace operation made some undesired changes

bug 4247

in _unpack_node_info_members().

Bug 4389

Add  special case for SELECT_PLUGIN_CRAY_CONS_RES, SELECT_PLUGIN_CRAY_LINEAR
to select_get_plugin_id_pos()

Bug 4389

If a pending federated job exists on clusters 2 and 3 and squeue is run
from cluster 1 then the active siblings can come and go depending on
which cluster returns the job info first and depending if that cluster
is the origin cluster or not. The origin cluster only knows where the
active siblings are.

from status commands.

Bug 4341

Add in strong_alias calls so these functions will appear in
libslurm and not just libslurmfull. Otherwise test7.3 can fail
due to a missing symbol if a gpu gres is allocated to the job.

Bug 4415.

Bug 4404.

This setting causes /unix to be omitted from the xauth string.
Simplify the regex to handle this by adding / to the earlier match and
dropping the /unix pattern.

Bug 4417.

Previous work doubled up a variable in commit 63c04b42
bug 4400

bug 4400

bug 4256

Bug 4379

Can cause slurmstepd to crash, as rlimit_name was pointing to
part of the free'd env_name variable.

Bug 4409.

This patch has fixed the problem to me. We are going to do some more
verification later today and update.
But I would appreciate if somebody else can test it as well.

Signed-off-by: Danny Auble <da@schedmd.com>

There was a list of pending pack job records under consideration
  for scheduling by the backfill plugin that was not being cleared
  between interations of the backfill scheduler resulting in various
  scheduling anomalies.
bug 4371, 4400

An abort was triggered here due to a pack job start failure.

This was causing a segfault of the slurmd on load since the while loop
could go into the

	if (f == 0) {

section and thus use the now freed array.

code dealing with how we need to keep track of it.

Bug 4405

For heterogeneous job steps, the srun --open-mode option default value will
    be set to "append".

Previous logic would fail if more than 2 pack groups implicitly
  specified in srun command.

Previous logic would delay the initiation of pack jobs until all
  components were submitted. The new logic will defer pack job
  scheduling based upon a new "pack_job_offset" field in the
  job submit request and NOT set a begin_time in the future.
  This will eliminate the pack job scheduling reason value
  of "BEGIN_TIME".
bugs 4369, 4400

Fix for bug introduced in commit 9e0b976a
bug 4400

The regex in x11_set_xauth() did not match FQDNs because it was missing
a dot.

Bug 4398.

If a node's physical Boards, Sockets, Cores, Threads, etc.
  differ from configuration log using error() rather than info().
bug 4394