Add a helper CommandController for managing domains
For testing multisite installations and managing the domain records while the management module isn't finished it's useful to add a CommandController to add / delete / search domain records.
[FEATURE] Add managing domain records & listing of sites commands
Add a command controller to add / delete and search domain records
to manage multi site installations.
Add a list command for the site command controller to be able to
see site node name needed for the domain command controller.