Bug 3321

Fix from 08490068

This capability is no longer related to the PrologParameters.

No longer needed with SendGIDs gone.

And populate gids if not sent from slurmctld in the cred.

Now included in the cred instead, no need for SendGIDs
implementation now.

Stop sending them separately.

Force the RPC format used to communicate with slurmstepd to the latest.
(This is separate from the field used to indicate what version the srun
command is expecting to see, so stop conflating the two of them.)

This format is used to setup the slurmstepd, so add the
fields here so they can be send down directly as part of
the launch message instead of as a separate series of
safe_write() calls.

This format is used to setup the slurmstepd, so add the
fields here so they can be send down directly as part of
the launch message instead of as a separate series of
safe_write() calls.

And optionally the ngids and gids. This is still using
PROLOG_FLAG_SEND_GIDS to decide whether to send the gids list,
this will change in a later commit.

getgrouplist() is highly dependent on LDAP performance,
but getgroups() is just lookup up the gids that the process
is operating under.

the list being destroyed right after.

Use --disable-x11 option to configure to turn these flags off,
which will let you use the SPANK plugin instead.

Fix name of macro when enabled to WITH_SLURM_X11.

Only set macro when successful; do not end up with a
config.h line of `#define WITH_SLURM_X11 0` as that would
preclude the use of `#ifdef WITH_SLURM_X11`.

The HAVE_NTR_H macro is already managing this test anyways.