tests: early bail-out on bad status or new core file(s)

This started as a way to identify which test created new core files,
since that's a critical piece of debugging information that's missing
when we only check for cores at the end of a run.  It also exits
*immediately* either on bad status or discovery of a new core file.
This allows the run to be retried or aborted quickly, to reduce the
latency of all jobs in the regression-test pipeline.

Change-Id: Ib4a1c779b44f041ab8728f772874f6c23de95929
Signed-off-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-on: http://review.gluster.org/10157
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Tested-by: NetBSD Build System
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

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