Update the asset plugin for download power consumption data

- Update the asset plugin
- Add power_consumption column to device model
- Update assets plugin tests
- Create schemamigration for updated model
Fix Flake8 and add commants

- Update flake8 rules
- Add comments to assets plugin and devices model
Change comment for the deprecation rate problem
Fix comments and change single line statemant to classic if statement

- Fix a mistake in comment
- Used common schema for comments
- Change single line statement to classic if statement
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
Fix flake8
Fix tests
Merge branch 'release/1.2.8' into develop
Create new plugin for power_consumption with tests

- Create new plugin for power_consumption
- Add required fields to model
- Create schemamigration
- Update assets plugin
- Flake8
- Create tests for new plugin
Merge branch 'develop' into feature/create-plugin-to-custom-fields-assets
Clean befor pull request

- Remove needless fields
- Fix tests
- Flake8
Fix flake8
Set 0 if deprecation rate is null when run assets plugin

- Set deprecation_rate on 0.00 when is null
Merge pull request #80 from kula1922/hotfix/set_0_if_deprecation_rate_is_null_when_run_assets_plugin

Set 0 if deprecation rate is null when run assets plugin
Merge branch 'develop' into feature/create-plugin-to-custom-fields-assets

Conflicts:
	src/ralph_pricing/plugins/assets.py
Price for each warehouse and generate raport for each warehouse

- Add field to choose warehouse when type price
- Add field to choose warehouse when generate raport
- Create plugin to import warehouses
- Update assets plugin on take warehouse id
- Add new fields to model for warehouse relation
Flake8
rely on assets instead of devices
Merge branch 'develop' into feature/get-rid-of-devices-dependency