Fix obsolete patch statements

These test patches will not work now that everything uses
`zino.snmp.get_snmp_session()` - the SNMP class needs to be patched
in the correct location.

tests/tasks/conftest.py

@@ -21,7 +21,7 @@ def unreachable_task():
     device = PollDevice(name="nonexist", address="127.0.0.1", community="invalid", port=666)
     state = ZinoState()
     task = ReachableTask(device, state)
-    with patch("zino.tasks.task.SNMP.get") as get_mock:
+    with patch("zino.snmp.SNMP.get") as get_mock:
         get_mock.side_effect = TimeoutError
         yield task
     task._deschedule_extra_job()

tests/tasks/test_task.py

@@ -25,7 +25,7 @@ async def test_get_sysuptime_raises_timeout_error(self):
         device = PollDevice(name="nonexist", address="127.0.0.1", community="invalid", port=666)
         state = ZinoState()
         task = ReachableTask(device, state)
-        with patch("zino.tasks.task.SNMP.get") as get_mock:
+        with patch("zino.snmp.SNMP.get") as get_mock:
             get_mock.side_effect = TimeoutError
             with pytest.raises(TimeoutError):
                 await task._get_uptime()

tests/tasks/test_vendor.py

@@ -22,7 +22,7 @@ async def test_run_should_raise_exception_when_there_is_no_response(self):
         device = PollDevice(name="localhost", address="127.0.0.1", community="invalid", port=666)
         state = ZinoState()
         task = VendorTask(device, state)
-        with patch("zino.tasks.task.SNMP.get") as get_mock:
+        with patch("zino.snmp.SNMP.get") as get_mock:
             get_mock.side_effect = TimeoutError
             with pytest.raises(TimeoutError):
                 await task.run()