Force zero return code if death testing.
Force zero return code if death testing.

- Since SLURM may report the return code back to the caller we must force
  it to zero so that "make check" will properly show a PASS.

Change-Id: I9538e8ed5aea8a099c35a9acdf0af0b216ebb427
Signed-off-by: Geltz, Brad <e42f3ad4099980ea02f08e076efbee5cf9d4a803@intel.com>

cmcantalupo/geopm,geopm/geopm,cmcantalupo/geopm,sssylvester/geopm,sssylvester/geopm,cmcantalupo/geopm,geopm/geopm,sssylvester/geopm,sssylvester/geopm,geopm/geopm,geopm/geopm,geopm/geopm,cmcantalupo/geopm,cmcantalupo/geopm