overlay/017: silence test output

Change test to output golden silence on success.

We are going to run the same check several times,
so instead of cloning the test output, cloning the
silence will be more conveniet.

Generalize cleanup of temp files for the same reason.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/overlay/017

@@ -40,6 +40,7 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
 
 _cleanup()
 {
+	cd /
 	rm -f $tmp.*
 }
 
@@ -73,7 +74,7 @@ mknod $lowerdir/fifo p
 _scratch_mount
 
 
-rm -f $tmp.before $tmp.after
+rm -f $tmp.*
 
 # Test stable stat(2) st_ino
 
@@ -89,11 +90,13 @@ done
 
 # find by inode number - expect to find file by inode number
 cat $tmp.before | while read ino f; do
-	find $f -inum $ino -maxdepth 0 | _filter_scratch
+	find $SCRATCH_MNT/ -maxdepth 1 -inum $ino | grep -q $f || \
+		echo "$f not found by ino $ino"
 done
 
 # Compare before..after - expect silence
 diff $tmp.before $tmp.after
 
+echo "Silence is golden"
 status=0
 exit