Cannot use LXD password auth in UI (3.1)

[Anton Smith]

It's possible to add a LXD VM host using password auth via CLI, but no longer via GUI.
Version 3.1.0

To reproduce:

Click KVM page-> Add LXD Host
Fill in details (in my case, it is an LXD host I've previously added, but previously I have been able to add the same host multiple times).

From the authentication screen, select password and enter a valid password. Proceed, and will be thrown back to the first screen, with the following error displayed:

"Error:

Failed talking to pod: VM Host 0: No certificates available"

Furthermore, from this screen, it is no longer possible to proceed by clicking "next", and I have to exit and go back to the KVM page to try again (with the same results).

(Note: this LXD host is added once and working with password authentication, and was added via CLI).

[Alberto Donato (ack)]

The UI is not passing certificates when getting projects for a LXD with the password:

{
 "method":"pod.get_projects",
 "type":0,"params":
 "password":"maas",
 "power_address":"localhost",
 "type":"lxd"
}