https: T5902: remove virtual-host configuration
We have not seen the adoption of the https virtual-host CLI option.
What it did?
- Create multiple webservers each listening on a different IP/port (but in the same VRF)
- All webservers shared one common document root
- All webservers shared the same SSL certificates
- All webservers could have had individual allow-client configurations
- API could be enabled for a particular virtual-host but was always enabled on the default host
This configuration tried to provide a full webserver via the CLI but VyOS is a
router and the Webserver is there for an API or to serve files for a local-ui.
Changes
Remove support for virtual-hosts as it's an incomplete and thus mostly useless
"thing". Migrate all allow-client statements to one top-level allow statement.