btrfs/029: filter mkfs and cp output

I noticed while testing a different mkfs option that btrfs/029 was
failing because it was getting the extra output from our mkfs.btrfs.
After I fixed that I was still failing because my version of cp will
spit out the source and destination files, not just the destination
file.  So redirect _scratch_mkfs to /dev/null like everybody does
and make the golden output just expect to see "cp failed" instead of
the cp specific output.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

tests/btrfs/029

@@ -66,7 +66,7 @@ mkdir $SOURCE_DIR
 
 rm -f $seqres.full
 
-_scratch_mkfs
+_scratch_mkfs > /dev/null 2>&1
 $XFS_IO_PROG -f -c 'pwrite -S 0x61 0 9000' $SOURCE_DIR/original \
  >> $seqres.full
 
@@ -87,8 +87,8 @@ _create_reflinks_to()
     # always reflink, should fail outright
     rm -rf $1; mkdir $1
     echo "reflink=always:"
-    cp --reflink=always $SOURCE_DIR/original $1/copyfail \
-        2>&1 | _filter_testdirs
+    cp --reflink=always $SOURCE_DIR/original $1/copyfail > $seqres.full 2>&1 \
+	|| echo "cp reflink failed"
 
     # The failed target actually gets created by cp:
     ls $1/copyfail | _filter_testdirs

tests/btrfs/029.out

@@ -4,12 +4,12 @@ reflink=auto:
 42d69d1a6d333a7ebdf64792a555e392  TEST_DIR/test-029/original
 42d69d1a6d333a7ebdf64792a555e392  SCRATCH_MNT/test-029/copy
 reflink=always:
-cp: failed to clone 'SCRATCH_MNT/test-029/copyfail': Invalid cross-device link
+cp reflink failed
 SCRATCH_MNT/test-029/copyfail
 test reflinks across different mountpoints of same device
 reflink=auto:
 42d69d1a6d333a7ebdf64792a555e392  TEST_DIR/test-029/original
 42d69d1a6d333a7ebdf64792a555e392  SCRATCH_MNT/test-bis-029/copy
 reflink=always:
-cp: failed to clone 'SCRATCH_MNT/test-bis-029/copyfail': Invalid cross-device link
+cp reflink failed
 SCRATCH_MNT/test-bis-029/copyfail