Allow creation and editing of physical managed networks

[edlerd]

Done

• allow creation and editing of physical managed networks
• add support for all ipv4, ipv6, dns and ovn options for physical networks
• hide status from physical manage network overview, as they don't expose state.
• change ip address selector label from "off" to "none" to be consistent with cli and internal naming.
• disable instead of hide the ipv* nat option in the network main form. This is to avoid a "changed the number of rendered hooks" error.

Fixes WD-11519
Fixes #786

QA

1. Run the LXD-UI:
   • On the demo server via the link posted by @webteam-app below. This is only available for PRs created by collaborators of the repo. Ask @mas-who or @edlerd for access.
   • With a local copy of this branch, run as described here.
2. Perform the following QA steps:
   • create and edit a physical managed network
   • create and edit a bridge network

[webteam-app]

Demo

Jenkins

demos.haus

[mas-who]

QA looks good! Just a few minor comments

[mas-who]

LGTM 👍