LU-13700 test: increase sanity 230o/230p wait time

LU-13700 test: increase sanity 230o/230p wait time

ZFS may be slow to finish dir split/merge in time, triple wait time
to avoid failure.

Test-parameters: trivial fstype=zfs testlist=sanity mdscount=2 \
mdtcount=4 env=ONLY=230,ONLY_REPEAT=30

Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: I3d28c942ac925ea201936b53d0487d9a6bf9376c
Reviewed-on: https://review.whamcloud.com/39119
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>