Make it not need root (mostly for test/dev)

[laduke]

Just a nice to have type of thing.

When you cargo run as root or make test-integration, it creates root owned files in ./target. Then you need to be root anytime you do anything with cargo after that, or at least delete .cargo-lock

I think it needs root to

• read the system's authtoken.secret
  there's already a flag for specifying this file, so this might be already work around able
  there's also a standard user location for a copy of authtoken.secret to exist. maybe i'll make it search there too.
• bind to port 53
  on macos, it just lets you bind 53 as a user. on linux, you could modify your system to allow it. but maybe the port should configurable.
  I don't know enough about dns to know if this type of dns server ever wants to be bound to a non 53 port. Probably only if it's getting queried by another server, not by the end user/os.

[laduke]

meh