LU-10199 utils: disable sanity test 56xb

LU-10199 utils: disable sanity test 56xb

The new sanity test 56xb introduced by changeset 25851 fails due
to a mismatch in the returned vs. expected value.  Disable the test
until it can be fixed.

Test-Parameters: trivial
Signed-off-by: Steve Guminski <stephenx.guminski@intel.com>
Change-Id: I12b88eccdf7954ae854133b48cadf7054c8f683e
Reviewed-on: https://review.whamcloud.com/29954
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>