[sonic-host-services] Add 'parameterized' package as a test dependency (#7900)

#### Why I did it

Recently, the build started failing with messages like

```
2021-06-16T16:55:02.8675603Z tests/hostcfgd/hostcfgd_test.py:5: in <module>
2021-06-16T16:55:02.8676208Z     from parameterized import parameterized
2021-06-16T16:55:02.8677145Z E   ModuleNotFoundError: No module named 'parameterized'
```

Unit tests for hostcfgd depend on the `parameterized` Python package, but it was never added as a dependency to the setup.py file. This dependency was added ~3 months ago. I'm not sure why we only started seeing this failure recently.

#### How I did it

Add 'parameterized' package as a test dependency in setup.py for sonic-host-services package

src/sonic-host-services/setup.py

@@ -35,6 +35,7 @@ setup(
         'wheel'
     ],
     tests_require = [
+        'parameterized',
         'pytest',
         'sonic-py-common'
     ],