iotests: Fix cleanup path in some tests

Some iotests leave behind some external data file when run for qcow2
with -o data_file.  Fix that.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200224171631.384314-1-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>

tests/qemu-iotests/085

@@ -39,6 +39,7 @@ SNAPSHOTS=10
 _cleanup()
 {
     _cleanup_qemu
+    _cleanup_test_img
     for i in $(seq 1 ${SNAPSHOTS})
     do
         _rm_test_img "${TEST_DIR}/${i}-${snapshot_virt0}"

tests/qemu-iotests/087

@@ -26,6 +26,12 @@ echo "QA output created by $seq"
 
 status=1	# failure is the default!
 
+_cleanup()
+{
+    _cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
 # get standard environment, filters and checks
 . ./common.rc
 . ./common.filter

tests/qemu-iotests/279

@@ -26,7 +26,7 @@ status=1	# failure is the default!
 _cleanup()
 {
     _cleanup_test_img
-    rm -f "$TEST_IMG.mid"
+    _rm_test_img "$TEST_IMG.mid"
 }
 trap "_cleanup; exit \$status" 0 1 2 3 15