Description of problem:
To group oVirt specific bits, Node should get it's own dashboard in Cockpit.

There is already one for kubernetes (https://github.com/cockpit-project/cockpit/blob/master/pkg/kubernetes/dashboard.js) which can be used for reference.

Contents of the dashboard (only passive):

Statistics
List VMs
Actual accumulated VM usage charts (cpu/mem/disk/net)
View SSH Host key
Network IP address information
HE Status