Allow ControlMachine, BackupController, DbdHost and DbdBackupHost to be either short or long hostname.

Bug 1921

And add missing documenation.
Bug 1921

GRES were not being properly tracks for multiple simultaneous steps.
A step which could have run later could be rejected as never being
able to run.
Replacement for commit dd842d79, which was reverted in commit 6f73812875c
bug 1925

That commit would address a limited subset of problems and introduce
other bugs rather than fixing the root of the problem.

Conflicts:
	src/plugins/slurmctld/nonstop/msg.c

comes.

Conflicts:
	src/plugins/slurmctld/nonstop/msg.c
	src/slurmctld/reservation.c

Modify advanced reservation save/restore logic for core reservations to
support configuration changes (changes in configured nodes or cores counts).
Previous logic would save the system-wide core bitmap and it was not
possible to reliably keep the same cores in the reservation if the
configuration changed.
bug 1864

and you use all the GRES up instead of reporting the configuration isn't
available you hold the requesting step until the GRES is available.

Conflicts:
	src/common/slurm_protocol_pack.c

Don't trucate task ID information in "squeue --array/-r" output.
Task ID info in sview also expanded to 64 characters (from ~16 chars).

Fix for bad cut and paste.  Looks like the original code was just a copy
of the access parsing.

last_time would be uninitialized.