* Honeywell fixes and improvements
Give the Honeywell device a state ('On', 'Off', etc) that
can be displayed to user and understood by other components.
Previously this was always 'Unknown'. Update also raises a
state_changed event when a new temperature is polled.
These two together fix an issue (#8688) where Honeywell
climate data couldn't be logged in InfluxDB.
* Roll back some changes
These were not necessary to achieve the result I wanted.
* Renamed RoundThermostat's 'device' member for greater clarity
Now called 'client'
* Improve and simplify discovering thermostat mode
Per code review, this is a rather neater way to discover the thermostat mode
* Update tests for compatibility with new component
The tests previously relied upon the update() method being
called in the constructor. This is no longer the case.
* Address formatting review comment
Parens not necessary
* This system mode is not certain to apply to domestic hot water
Moved the mode lookup to only happen on update of radiator devices,
since hot water devices seem to be treated differently and I can't test.
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