bug(lxd): lxc.config.device disk source shouldn't be required

[kellian-cottart]

Describe the bug

lxc.config.device disk source shouldn't be required, as it hinders the usage of certain commands that don't require the source to be specified.

Example Project

Let's say you're building a cluster with lxc.cluster. If you want to configure the size of the root disk of each instance, you would have to do this:

 await @lxc.config.device
      $header: config.container + ' - Configuring devices...'
      container: config.container
      device: 'root'
      type: 'disk'
      properties:
        pool: 'local'
        path: '/'
        size: '50GB'

This is not working because the source needs to be specified according to the schema, but the final command rejects usage of source if you add one.

Current bug behavior

Schema specifies the need of a source, but some commands don't necessitate this source.

Expected correct behavior

Schema should allow the user to ignore the source.

Possible fixes

The file full path is node-nikita/packages/lxd/src/config/device/index.coffee.md.

A simple fix would be changing line 83 from:

required: ['path', 'source']

To:

required: ['path']

[wdavidw]

ok

[kellian-cottart]

Corresponding PR fix: #390