libsystemd-rtnl: merge into libsystemd
udev: net_setup_link - don't use Description as Alias Use Description only internally, and allow Alias to be set as a separate option. For instance SNMP uses ifalias for a specific purpose, so let's not write to it by default.
rtnl: headers in src/systemd/ may not include internal headers Hence including "util.h" from sd-rtnl.h is not OK. Let's minimize our headers we pull in a bit.
rtnl: internal headers must include pragma once protection
udev: link-config - let udevd set the ifname
rtnl-util: add missing files