LU-10686 tests: stop running sanity-pfl test 9

LU-10686 tests: stop running sanity-pfl test 9

sanity-pfl test 9 consistently fails when run on a Lustre
file system with a single MDS. We need to add test 9 to
the ALWAYS_EXCCEPT list and, thus, stop running the test
until a fix for the underlying problem can be found.

Test-Parameters: trivial mdscount=1 mdtcount=1 testlist=sanity-pfl
Test-Parameters: mdscount=2 mdtcount=2 testlist=sanity-pfl
Signed-off-by: James Nunez <jnunez@whamcloud.com>
Change-Id: Ife4b3c044e2777bb9b9010e0be7c00549a683fdc
Reviewed-on: https://review.whamcloud.com/32945
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Wei Liu <sarah@whamcloud.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>