LU-9556 tests: wait recovery complete in replay-single test 57

LU-9556 tests: wait recovery complete in replay-single test 57

This patch fixes replay-single test 57 to wait recovery complete
for MDS and also wait for sync between MDS and OSS instead of
just sleeping for 1 second.

Test-Parameters: trivial envdefinitions=ONLY=57 \
testlist=replay-single,replay-single,replay-single

Change-Id: I8ca133104116383eccec324ab2ef56666659600e
Signed-off-by: Jian Yu <jian.yu@intel.com>
Reviewed-on: https://review.whamcloud.com/27279
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>