Shut down the coordinator after tests to avoid lingering timer exceptions (#424)

Author: mill1000

tests/test_coordinator.py

@@ -234,3 +234,5 @@ async def test_group5_entity_request_enable(
     await entities[1].async_will_remove_from_hass()
     assert coordinator._group5_entities == 0
     assert device.enable_group5_data_requests == False
+
+    await coordinator.async_shutdown()

tests/test_sensor.py

@@ -58,3 +58,5 @@ async def test_energy_sensor_request_enable(
     await sensors[1].async_will_remove_from_hass()
     assert coordinator._energy_sensors == 0
     assert device.enable_energy_usage_requests == False
+
+    await coordinator.async_shutdown()