* Add tests to reach full coverage for helpers/state.py.
* Refactor reproduce_state function in helpers/state.py. Add two dicts,
as global constants, service_attributes and service_to_state. Use
these in combination with the dict of services per domain from
ServiceRegistry, to find the correct service to use in a scene state
change.
* Use break statement in for loop, to break if service was selected
to update state, in preference to update state attributes, ie state
update takes precedence.
* Add ATTR_CODE and ATTR_CODE_FORMAT in const. Import these in
alarm_control_panel and lock platforms instead of making duplicate
constants in multiple modules.
* Use ATTR_MEDIA_CONTENT_TYPE and ATTR_MEDIA_CONTENT_ID in media_player
platform in SERVICE_PLAY_MEDIA and play_media methods, instead of
'media_type' and 'media_id'.
* Fix PEP257 in modified files.
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