LU-14765 test: disable sanity-flr/44c

LU-14765 test: disable sanity-flr/44c

file blocks number accounting does not include blocks occupied by
multiple mirrors, disable the test for now.

Test-Parameters: trivial
Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: I1a5d7e0c203d5c7dc0da53ce6c020795bf17b9fc
Reviewed-on: https://review.whamcloud.com/44074
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>