server: Split out code to initialize the socket address for a display name
server: Split out code to initialize the socket address for a display name

We'll use this to autodetect a good socket to open on.

mchalupa/wayland,eyolfson/wayland,bitfactor/wayland,tulcod/wayland,sir-murray/wayland,sir-murray/wayland,tulcod/wayland,bitfactor/wayland,abooij/wayland,eyolfson/wayland,abooij/wayland,sir-murray/wayland,bitfactor/wayland,tulcod/wayland,mchalupa/wayland,eyolfson/wayland,mchalupa/wayland,abooij/wayland