LU-15757 test: disable sanityn test_102() for zfs

LU-15757 test: disable sanityn test_102() for zfs

sanityn test_102() on zfs causes clients to crash on umount about half
the time. Disable this test until this can be sorted out.

Test-Parameters: trivial testlist=sanityn fstype=zfs mdtcount=4
Signed-off-by: John L. Hammond <jhammond@whamcloud.com>
Change-Id: If9f7c77f8c68eee88b3f050fc26c42c21828e2c9
Reviewed-on: https://review.whamcloud.com/47311
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Lai Siyao <lai.siyao@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>