[PATCH] Add support for whitelisting and blacklisting IP addresses

[jpfau]

I have a setup where an interface has multiple IP addresses, with different things listening on the same port on the different IP addresses. However, avahi lumps them all in together, and was prioritizing them in a way that broke my setup.

A good solution would be to tell avahi which IP addresses it should use, so I added support for that.

[jpfau]

Patch

[jpfau]

I did a bit of refactoring in this patch, which I apologize for lumping into this patch, but it simplified the copy code a lot.