Add voluptuous to Loopenergy

[pavoni]

Description:
This adds voluptuous to Loopevergy.

It also makes a breaking change to the config of this (little used) sensor to use a revised config structure nesting the config data to make validation easier.

Related issue (if applicable): fixes #

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

Example entry for configuration.yaml (if applicable):

New

sensor:
  - platform: loopenergy
    electricity:
      electricity_serial: 'xxx'
      electricity_secret: 'yyy'
    gas:
      gas_serial: 'xxx'
      gas_secret: 'yyy'
      gas_type: imperial
      gas_calorific: 38.2

Old

sensor:
  - platform: loopenergy
    electricity_serial: 'xxx'
    electricity_secret: 'yyy'
    gas_serial: 'xxx'
    gas_secret: 'yyy'
    gas_type: imperial
    gas_calorific: 38.2

Checklist:

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.io

If code communicates with devices, web services, or a:

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.

If the code does not interact with devices:

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• Tests have been added to verify that the new code works.

.# Please enter the commit message for your changes. Lines starting

[fabaff]

For the sake of consistency I would like to suggest that we use CONF_ as prefix for configuration relevant constants. Sorry, it's a bit petty.

[pavoni]

No problem. Hopefully sorted.

[fabaff]

Looks good to me.

Another addition for the future could be to use the unit_system: value of the configuration for gas_type as default.

[pavoni]

Thanks @fabaff. Are you happy for me to merge?

I think these guys only sell their product in the UK - and the type of gas meter you have is more related to when it was fitted to your home, rather than the local measurement convention, so not sure linking to the unit_system is much of a win.

[fabaff]

Are you happy for me to merge?

I am.

[pavoni]

Thanks.