Ensure the file has been create with the appropriate length before
mmap()'ing the buffer.

This was a false-positive in Coverity, and extending the mmap()
to silence that warning is incorrect.

This reverts commit ac5d85d5.

HAVE_NATIVE_CRAY is equivalent at this point.

HAVE_REAL_CRAY is equivalent to HAVE_NATIVE_CRAY at this point.

One level up - src/plugins/proctrack/Makefile.am - will only build
proctrack/cray if HAVE_NATIVE_CRAY is set, so this test against
HAVE_REAL_CRAY is redundant.

Cray Aries systems do not run with --enable-frontend, so this is redundant.
(But was previously relevant for Cray ALPS support.)

Coverity CID 45153

Coverity CID 45163

Coverity CID 45162

This eliminates code that's dead on non-cray systems
Coverity CID 44818

Check for negative index

Add "return" after "fatal()" to avoid error
Coverity CID 45267

Coverity CID 187084

This eliminates a resource leak error from Coverity
Coverity CID 174433

Coverity CID 45041

Coverity CID 178897

This shouldn't happen in practice, but prevent the possibility
Coverity CID 182987

This shouldn't happen in practice, but prevent its possibility
Coverity CID 182988

Clears Coverity error

Coverity CID 195596

Fix format of comments

Bug 4105

Add mapping from task to originating pack index to allow the stepd to identify which tasks are part of which packs

Bug 4105

Not totally working, but not ever used.

Bug 4105

Bug 4105

Bug 4105

Bug 4105

The task/cgroup plugin sets the UID patch based upon the pack_jobid
   (if a pack job). This is needed for Cray systems.

Bug 4105