Ignore disabled networks when rendering templates.
Add's the ctlplane network to maps to ensure we don't
end up with no keys/values in map_replace functions.
Also some Jinja cleanup:
- Reduce the number of times we iterate over networks
where we can.
- Add's indentation to make the code easier to read.
Related-Bug: #1809313
Depends-On: I2e8135bc9389d3bf1a6ef01e273515af5c488a9a
Change-Id: Ifeb2d2d1acb43c16a5bf29e95965776494d61fef
53027484ae