test: Allow daemon to take 5 seconds for shutdown

It seems like shutdown can take more than 2 seconds on some slow
systems. So increase to 5 seconds which hopefully is long enough.

Closes: #188

src/linux/integration-test.py

@@ -231,7 +231,7 @@ class Tests(dbusmock.DBusTestCase):
             except OSError:
                 pass
             try:
-                self.assertEqual(self.daemon.wait(timeout=2.0), 0)
+                self.assertEqual(self.daemon.wait(timeout=5.0), 0)
             except subprocess.TimeoutExpired:
                 try:
                     self.daemon.kill()