Add net counters

[testuser7]

Add counters:

• lifetime_production_net (l1, l2, l3)
• consumption_net (l1, l2, l3)
• lifetime_consumption_net (l1, l2, l3)

Consumption should be metered only when consumption CTs are installed.

[catsmanac]

Thanks @testuser7, I'll merge with v0.0.17 into dev-test as v0.0.18-dev-01.

First inspection looks good, only 1 minor issue I'll update in the merge process.

lifetime_production_net should be set to some value containing 'not available' if it's not available on some Envoy types, same as you did for consumption_net. Currently it's set to null causing the entity to be created. Minor issue as said.

      "lifetime_production_net": null,
      "consumption_net": "Consumption data not available for your Envoy device.",

I'll let you know when done so you can take it for a test ride, I only have a plain vanilla Envoy so I can't really test it, just confirm it doesn't crash or create unneeded entities.

[catsmanac]

Hi @testuser7, when merging I noticed below code added. Since consumptionnet starts with consumption_ as well I'd expect the consumption net phase data would be fed from envoy_reader.consumption_phase rather then from envoy_reader.consumption_net_phase. If I'm not mistaking we need to swap the order so consumptionnet test is first and same for the other alphabetical tests?

[testuser7]

Thank you for the review. All these things need to be changed in the code.

But after adding the import/export indexes, this PR makes the same changes in a different way.