LU-2414 tests: cleanup replay-single/0c and 44c

LU-2414 tests: cleanup replay-single/0c and 44c

Switch from return codes to error messages in test_0c and test_44c.

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: I61895442fa52e2f7bff421e0b8309f0f11c97de8
Reviewed-on: http://review.whamcloud.com/4856
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Hudson
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>