LU-482 tests: abort replay-dual if test_0a fails

LU-482 tests: abort replay-dual if test_0a fails

Due to repeated and annoying LU-482 failures of replay-dual.sh
test_0a, abort the whole test script if test_0a fails.  While this
is not ideal, it is better than disabling replay-dual.sh entirely.

Until bug TT-554 is fixed to display "SKIP" results from a test in
Maloo, we should still be able to detect the LU-482 failures because
replay-dual test will complete in a few seconds instead of thousands.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I4bc6b62e0028b908f0fc8afaab0030b0fcdf500c
Reviewed-on: http://review.whamcloud.com/2731
Tested-by: Hudson
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Reviewed-by: Li Wei <liwei@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>