Plugins do not and should not keep pointers in to buf.

And update all calling locations. Note that this removes a lot
of unnecessary calls to slurm_get_auth_info() which should serve
as a slight performance speedup.

Now unused. This info should only be needed at verification time,
which must happen before any slurm_auth_get_*() calls.

bug 6646

Insure that each MPS server has a single/common percentage of a GPU

Add module to the Makefiles
Add test description to README (used for logging to stderr)
If "date" fails and an error (FAILURE) is logged, then make the test
  have an exit 1
If the test can not run due to configuration then do not log as
  a failure and exit 0

Coverity CID 195594

Coverity CID 195725

Bug 6633.

Coverity CID 195599

Coverity CID 195608

Coverity CID 195595

Coverity CID 195595

Coverity CID 195594

Coverity CID 195603 and 195605

Coverity CID 195610

Coverity CID 195592

Coverity CID 195593

Coverity CID 195604

Coverity CID 195609

Coverity CID 195606

Coverity CID 195598

Coverity CID 187785

Use slurm_seterrno(), rather than maintaining a plugin-local and
credential local version of that errno.

Remove g_slurm_auth_errno() and g_slurm_auth_errstr(). Replace all
calling locations with %m format identifiers which should pick up
the errno in that thread, which is now directly set by the auth plugin.

The one place that this represents a slight regression in functionality
is that we loose the specific EMUNGE errno values. However, the places
that will set this in the auth/munge plugin are already printing it
through an error() with munge_ctx_strerror(). Replace those two locations
with ESLURM_AUTH_CRED_INVALID instead.

While currently safe, this is blocking further refactoring, and
much less conceptually clean than testing the cred properly with
g_slurm_auth_verify().

Stop fetching a lot of (now) unused fields, and print the two
relevant lines. Drop errors to warnings - we know the decode
failed, so failure to retrieve the encode and decode time is
quite likely.

Unused, and until earlier in this commit series the auth/munge
plugin was printing to stdout directly rather than the fp argument.

Move the message for ESLURM_AUTH_UNPACK into slurm_auth.c, which
removes all error message handling except the complicated MUNGE handing
from the plugins. Adjust MUNGE_ERRNO_OFFSET far enough to avoid the
range these have just been renumbered into.

Use a new cred_wrapper_t struct designed to overlap the opaque cred
structures used within the individual plugins. Add the index value
to the start of each of these structures.

The index  is set when a given credential is unpacked, and used to lookup
the appropriate plugin for use with the remaining auth plugin
API calls.

The zeroth element is always the AuthType, and will be used by default.

This is currently only supported in the slurmctld and slurmdbd;
ignore this in all other calling locations.