LU-18116 tests: replay-single test_201 timeout

LU-18116 tests: replay-single test_201 timeout

19s is not enough for some system to finish MDT1 umount.
Increasing it to 20s + OSTCOUNT seconds.

HPE-bug-id: LUS-12689
Test-Parameters: testlist=replay-single
Fixes: ffedcbae21f7 ("LU-17809 osp: make disconnect asynchronous")
Signed-off-by:Alexander Boyko <alexander.boyko@hpe.com>
Change-Id: I900ce107ceb664530bc2165685ba7b88cbd46807
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58203
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Mikhail Pershin <mpershin@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>