* Add dedicated update information reload
Currently we have the /refresh_updates endpoint which updates the main
component versions (Core, OS, Supervisor, Plug-ins) and the add-on
store at the same time. This combined update causes more update
information reloads than necessary.
To allow fine grained update refresh control introduce a new endpoint
/reload_updates which asks Supervisor to only update main component
versions (learned through the version json files).
The /store/reload endpoint already allows to update the add-on store
separately.
* Add pytest
* Update supervisor/api/__init__.py
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