LU-2469 test: Skip failing ZFS tests

Skip tests that are currently failing for ZFS.  Associate with bugs so
that they can be unskipped when they are fixed.

Test-Parameters: mdsfilesystemtype=zfs ostfilesystemtype=zfs   mdtfilesystemtype=zfs
Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: I7fe3a2ad51659c4e31240594702a4cdc87a67336
Reviewed-on: http://review.whamcloud.com/5472
Tested-by: Hudson
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>