Reconnect before mochad switch send command (#11296)

* Connection to mochad occasionally stalls on RPi and CM19A. Reconnect one switch send command.

* Formatting and exception hanling fixes

* Moved import inside the method. Logging outside the try-catch.

* Tailing whitespaces.

* MockDependency on pymochad in unit tests to resolve exceptions

* patch pymochad MochadException in unit tests to resolve exceptions

* patch pymochad MochadException in unit tests to resolve exceptions

* cleaned unused import

* lint issue fixed

* pylint issue fixed

tests/components/switch/test_mochad.py

@@ -16,6 +16,7 @@ def pymochad_mock():
     """Mock pymochad."""
     with mock.patch.dict('sys.modules', {
         'pymochad': mock.MagicMock(),
+        'pymochad.exceptions': mock.MagicMock(),
     }):
         yield