Comment 3 for bug 1964765

I did try this, but this also appeared to stop scheduling of DHCP agents/ports to subnets when new networks are created, which was undesirable.

The other concern I had with changing this parameter was that if we had to replace a host which had previously provided DHCP to a set of networks, I believe the new host would have to be manually instructed to act as a DHCP agent for these networks, rather than being able to automatically assume the role.