baseimage: Don't configure networking

Looks like this configuration cause SDDM problems: the greeter
cannot connect to Xorg.

We already have default configuration file for /etc/hosts plus NM
creates /etc/resolv.conf so we don't need this setup.
kickstart: Fix systemd unit path

It's under /usr now.
kickstart: Don't write /etc/sysconfig/desktop

No one reads this file on Maui, hence it's not needed anymore.