tests: Give fprintd some more time to be ready

While the delay inhibitor is grabbed almost immediately, this can be
slow enough to not have happened immediately after the bus name has been
registered. Add a generous timeout to prevent issues.

tests/fprintd.py

@@ -615,7 +615,7 @@ class FPrintdVirtualDeviceBaseTest(FPrintdVirtualImageDeviceBaseTests):
                                   'GLib.idle_add(lambda fd: os.close(fd), ret)')
         self.daemon_start(self.driver_name)
 
-        self.wait_got_delay_inhibitor()
+        self.wait_got_delay_inhibitor(timeout=5)
 
         if self.device is None:
             self.skipTest("Need {} device to run the test".format(self.device_driver))