LU-4442 test: fix wrong usage of wait_mds_ost_sync()

Fix the wrong usage of wait_mds_ost_sync() in replay_vbr.sh
test_7_cycle(). The first parameter should be a timeout in seconds
not a facet.

Test-Parameters: testlist=replay-vbr envdefinitions=ONLY=7
Signed-off-by: Emoly Liu <emoly.liu@intel.com>
Change-Id: I4e6de62049b473deeaf5c75e1136d76d67a02053
Reviewed-on: http://review.whamcloud.com/8796
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Tested-by: Jenkins
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>