Fix comments, single line statemant and display power consumption in raport

- Fix a mistake in comment
- Used common schema for comments
- Add comments in devices view
- Change single line statement to classic if statement
- Add column power consumption to devices raport
Merge branch 'feature/create-plugin-to-custom-fields-assets' of https://github.com/kula1922/ralph_pricing into feature/create-plugin-to-custom-fields-assets

Conflicts:
	src/ralph_pricing/plugins/assets.py