Request has to fail if a connection parameter can not be accessed.
(cherry picked from commit 59fbe2ad)

Frontend: Use VirtualHost to separate from custom config, listens to plain http port as well to redirect to https

htdocs can contain user data

Reason : might be dangerous.

Use two dollars to pass to instance recipe.

Conflicts:
	software/kvm/software.cfg

Use new recipes in KVM to make instance not raise when no frontend is found,
Don't request slave kvm frontend instance on SAME machine,
Check if frontend is available using a promise