OVS Packages not supported, causing failures

[jhughesoti]

Usage of the wand package for OVS doesn't appear to be supported anymore and causes complete failures on ubuntu 20.04.

This from the bin/setup_base:

     # Make sure to get a reasonably up-to-date version of OVS.
     echo "deb http://packages.wand.net.nz $release main" | sudo tee /etc/apt/sources.list.d/wand.list
     $retry sudo curl http://packages.wand.net.nz/keyring.gpg -o /etc/apt/trusted.gpg.d/wand.gpg

Causes this issue on subsequent updates:
E: The repository 'http://packages.wand.net.nz focal Release' does not have a Release file.