9d5316ca0e
We want to be able to select the default for Socket differently in the future. This change augments the API for dkimpy_milter.util.own_socketfile() by adding an optional sockname argument. This is a backward-compatible change. If we aren't committed to API stability for this function, we could make a more invasive change that would probably be a more reasonable API going forward, but this is probably good enough.