xfs/030: filter out extra repair noise for finobt enabled fs'

xfs/030 nukes various on-disk data structures to test for repair. This
can result in extra output when testing finobt enabled filesystems. For
example, xfs_repair detects an invalid free inode btree root block when
the agi is zeroed.

Filter this output directly in xfs/030 such that the test passes for
finobt and non-finobt filesystems.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

tests/xfs/030

@@ -56,7 +56,8 @@ _check_ag()
 	do
 		echo "Corrupting $structure - setting bits to $1"
 		_check_repair $1 "$structure" |
-			sed -e '/^error following ag 0 unlinked list$/d'
+			sed -e '/^error following ag 0 unlinked list$/d' \
+			    -e '/^bad agbno AGBNO for finobt/d'
 	done
 }