LU-4039 tests: ensure osc import in FULL state

LU-4039 tests: ensure osc import in FULL state

The osp import may not in FULL state when
replay-single:test_90 start running. It
was caused by test_89, we should waiting
import valid then start next step.

Test-Parameters: trivial testlist=replay-single,replay-single,replay-single,replay-single
Signed-off-by: Yang Sheng <yang.sheng@intel.com>
Change-Id: I93746137c038183bf114619f53654af1bcaa68eb
Reviewed-on: http://review.whamcloud.com/20931
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>