Introduce button to unassign floating IP address in server details view
Follow-up to !441 (merged).
Problem/Opportunity Statement
When !441 (merged) is merged, it makes sense to allow the user to remove (un-assign) a floating IP address from an existing instance.
What would success / a fix look like?
In server details view, if the server has a floating IP address, provide a button to un-assign it.