* Ecobee: add current_humidity to humidifier
* Ecobee: Add test for current_humidity property
* Update current_humidity handling in climate and
humidifier entity to support the ecobee API
not returning actualHumidity, which is an optional
value.
Also updated tests to add a thermostat which
covers a non-populated humidity. In passing,
set up the new test thermostat to cover a missing
condition where the code doens't recognize the
ecobee model number. This gets ecobee humidifier
test coverage to 100%
c9ce848b4b