ZWave: Add reset service to meters

[turbokongen]

Description:

This adds a reset_node_meters service to zwave that can let the user reset values in the command_class_meter class. (I.e. kWh meter) This "button" will be present at index 33 of the values if the node supports it.

Pull request in home-assistant.github.io with documentation (if applicable): home-assistant/home-assistant.io#2674

[mention-bot]

@turbokongen, thanks for your PR! By analyzing the history of the files in this pull request, we identified @balloob, @andrey-git and @armills to be potential reviewers.

[andrey-git]

Why index 33? Could you point to documentation?

[turbokongen]

https://github.com/OpenZWave/open-zwave/blob/master/cpp/src/command_classes/Meter.cpp#L344-L355
Which points to: https://github.com/OpenZWave/open-zwave/blob/master/cpp/src/command_classes/Meter.cpp#L66

[andrey-git]

Ouch. This is ugly :(

[emlove]

Even though it looks like we'll only ever have the one, I think it's probably worth adding to zwave/const.py as METER_RESET_INDEX or something like that. At least then it can have a name. Otherwise LGTM.

[turbokongen]

You cant reset only one index of the command class. The button resets all meters of the instance.

[emlove]

I just meant adding METER_RESET_INDEX = 33 to zwave/const.py, and then referencing that instead of just 33 in here. Just to give it a name that mirrors this.