LU-14094 tests: give zfs more wait time again to unlink

LU-14094 tests: give zfs more wait time again to unlink

In sanity.sh test_311, give zfs more wait time to unlink more
files as expected.

Test-Parameters: trivial fstype=zfs testlist=sanity env=ONLY=311,ONLY_REPEAT=200
Test-Parameters: trivial fstype=zfs testlist=sanity env=ONLY=311,ONLY_REPEAT=200
Test-Parameters: trivial fstype=zfs testlist=sanity env=ONLY=311,ONLY_REPEAT=200
Test-Parameters: trivial fstype=zfs testlist=sanity env=ONLY=311,ONLY_REPEAT=200
Test-Parameters: trivial fstype=zfs testlist=sanity env=ONLY=311,ONLY_REPEAT=200
Signed-off-by: Emoly Liu <emoly@whamcloud.com>
Change-Id: I5ee3d8a0e205acbb199469c7572ce602dd7b5d22
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/59824
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Marc Vef <mvef@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>