stream: fix sectors not allocated test

The test on sectors not allocated can fail if the L1/L2 tables are
not on disk yet.  Allow tests to shutdown the VM early.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/030

@@ -78,6 +78,7 @@ class TestSingleDrive(ImageStreamingTestCase):
                     completed = True
 
         self.assert_no_active_streams()
+        self.vm.shutdown()
 
         self.assertFalse('sectors not allocated' in qemu_io('-c', 'map', test_img),
                          'image file not fully populated after streaming')

tests/qemu-iotests/iotests.py

@@ -87,10 +87,12 @@ class VM(object):
 
     def shutdown(self):
         '''Terminate the VM and clean up'''
-        self._qmp.cmd('quit')
-        self._popen.wait()
-        os.remove(self._monitor_path)
-        os.remove(self._qemu_log_path)
+        if not self._popen is None:
+            self._qmp.cmd('quit')
+            self._popen.wait()
+            os.remove(self._monitor_path)
+            os.remove(self._qemu_log_path)
+            self._popen = None
 
     def qmp(self, cmd, **args):
         '''Invoke a QMP command and return the result dict'''