When a buffer packed failed due to invalid message version, a NULL
  pointer was returned, which later resulted in an assert failure.
  This adds a check for a NULL pointer and avoids the assert.

Bug 3257.

Make it easier to see the 17.02 changes as they are added in.

RPCs will switch to using bit_str_hex for serialization from bit_fmt,
but receivers still need to access this as a inx formatted array for now.
Collapse this into one macro rather than repeating a bunch of times.

Note that this would be better performing if consolidated into a single
function rather than using unpack_bit_str_hex then bitstr2inx to convert;
although this is a client-side function and less important than avoiding
performance and throughput issues within slurmctld.

pack_bit_fmt can exceed 0xfffe characters on large systems and thus
truncate leading to:
"error: Credential signature check: Credential data size mismatch"

Add warning to the pack_bit_fmt macro to highlight issue.

Bug 3257.

bug 3072

bug 3072

scancel modified to note that no jobs satisfy the filter options when the
    --verbose option is used along with one or more job filters (e.g. "--qos=").
bug 3072

scancel would treat a non-numeric argument as the name of jobs to be
    cancelled (a non-documented feature). Cancelling jobs by name now require
    the "--jobname=" command line argument.
bug 3072

Coverity was reporting possibly unterminated string

Bug 3395

Replace version borrowed from Linux 2.4.9 with newer version in 4.9.

burst_buffer/cray - Avoid "pre_run" operation if not using buffer (i.e.
    just creating or deleting a persistent burst buffer).
bug 3391

Previous job state information was "PENDING" rather than "REQUEUED"
  for each job requeued due to a burst buffer error.
bug 3388

of before where we could return before we actually used it.

xfree is probably fine in this instance.

scheduling a Datawarp job.

The assoc_mgr lock needs to happen before the bb_state.bb_mutex.  One place
this could cause deadlock is from src/slurmctld/controller.c
_accounting_cluster_ready() which calls clusteracct_storage_g_cluster_tres
which inturn calls bb_g_job_set_tres_cnt which calls bb_p_job_set_tres_cnt
which will lock the bb_muxtex after the assoc_mgr is already locked.

Bug 3389

bluegene system.

Bug 3331

and erroneous error later on.

Cache results of bit_set_count() calls.

Bug 3393.