LU-2356 tests: ensure recovery-small/10-12 recover fully

LU-2356 tests: ensure recovery-small/10-12 recover fully

Ensure recovery compeletes in tests 10, 11, and 12 before proceeding
to next test, otherwise it can cause the next test to fail.

This also ensure that partial test runs can be restarted cleanly by
fixing initial rm's of old test run files.

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: Ifa0e5c7344a23c112a69550ff308e3081e5a21d5
Reviewed-on: http://review.whamcloud.com/4615
Tested-by: Hudson
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>