Add tests for vera component (#28340)

* Adding tests for vera component.
Fixing update bug in the vera climate platform.

* Updating requrements file.

* Moving vera stop to a job.
Sorting imports.

* Addressing simple PR feedback.

* Splitting tests into platforms.

* Mocking controller instead of using requests_mock.

* Updating pyvera to use version that stops threads quickly.

* Updating requirements files.

* Mocking the pyvera module, not the API.

* Addressing PR feedback.
Handling start/stop of patch in fixture.
Removing unecessary code.

* Using generator

.coveragerc

@@ -750,7 +750,6 @@ omit =
     homeassistant/components/velbus/switch.py
     homeassistant/components/velux/*
     homeassistant/components/venstar/climate.py
-    homeassistant/components/vera/*
     homeassistant/components/verisure/*
     homeassistant/components/versasense/*
     homeassistant/components/vesync/__init__.py