LU-951 test: re-enable replay-single test_73a

LU-951 test: re-enable replay-single test_73a

Enable replay-single test_73a as bug resolved.

LU-2840 test: re-enabel sanityn test_21

Enable sanityn test_21 as bug resolved.

LU-1867 test: re-enable test_89

Enable replay-single test_89 as bug resolved.

Signed-off-by: Yang Sheng <yang.sheng@intel.com>
Change-Id: I78d8e21e2f454af07503d96c510beb9090b23ace
Reviewed-on: http://review.whamcloud.com/12227
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>