Comment 8 for bug 1671288

Due to the URI config being hard to used due to bugs like this:
https://bugs.launchpad.net/nova/+bug/1677913

Its tempting to add a new configuration to let to specify these SSH configuration settings. They would get ignored if the scheme != ssh.

I think we should note in the description that this is a way to share the ssh key between migrate and live-migration. I would say thats a really useful use case here.