LU-4444 tests: Skip conf-sanity/69 on zfs

LU-4444 tests: Skip conf-sanity/69 on zfs

Because file creates happen slowly on ZFS and the number of files
required to run the test is 100K, this test cannot run in a
reasonable amount of time.

Also bail out of test if createmany fails (possible if MDS or OST is
too small), this prevents the test from just timing out instead.

Test-Parameters: envdefinitions=SLOW=yes testlist=conf-sanity
Test-Parameters: envdefinitions=SLOW=yes testlist=conf-sanity mdsfilesystemtype=zfs mdtfilesystemtype=zfs ostfilesystemtype=zfs
Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: Ic8286c970332e0c53525e4d89e4c5f0e32cf57cb
Reviewed-on: http://review.whamcloud.com/8841
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>