xfstests: stop special casing nfs and udf

For historical reasons beyond my knowledge xfstests tries to abuse the
scratch device as test device for nfs and udf.  Because not all test
have inherited the right usage of the _setup_testdir and _cleanup_testdir
helpers this leads to lots of unessecary test failures.

Remove the special casing, which gets nfs down to a minimal number of
failures.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Sugned-off-by: Dave Chinner <david@fromorbit.com>

tests/shared/051

@@ -40,8 +40,7 @@ _cleanup()
 {
     cd /
     rm -f $tmp.*
-    [ -n "$testdir" ] && rm -rf $testdir/$seq.dir1
-    _cleanup_testdir
+    [ -n "$TEST_DIR" ] && rm -rf $TEST_DIR/$seq.dir1
 }
 
 # -----
@@ -76,14 +75,12 @@ _supported_os Linux
 
 rm -f $seqres.full
 
-_setup_testdir
-
 _need_to_be_root
 _acl_setup_ids
 _require_acls
 
 # get dir
-cd $testdir
+cd $TEST_DIR
 rm -rf $seq.dir1
 mkdir $seq.dir1
 cd $seq.dir1

tests/shared/218

@@ -34,7 +34,6 @@ _cleanup()
 {
     cd /
     rm -f $tmp.*
-    _cleanup_testdir
 }
 
 # get standard environment, filters and checks
@@ -46,7 +45,6 @@ _cleanup()
 _supported_fs xfs ext4 btrfs
 _supported_os Linux
 
-_setup_testdir
 # We require scratch so that we'll have free contiguous space
 _require_scratch
 _scratch_mkfs >/dev/null 2>&1