xfs/{050,144,153,299,330}: update quota reports to handle metadir trees

xfs/{050,144,153,299,330}: update quota reports to handle metadir trees

Prior to the new metadir feature in XFS, the rtbitmap and rtsummary
files were included in icount, though their bcount contribution is zero
due to rt and quota not being supported together.  With the new metadir
feature in XFS, no files in the metadata directory tree are counted in
quota.

Hence we must adjust the icount of any quota report down by two to avoid
breaking golden outputs.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>