Move sources toplevel for gitpkg

NM has submodules, easiest way is to package tarballs here.
Add libsoup-2.4 bdep as required by --enable-concheck
Define ppp version
Remove invalid systemd glob
Add missing systemd units
Don't depend on systemctl and fix systemd and udev paths

It's installed in %{_bindir} now, depending on systemd is enough.
Also update systemd and udev paths as they are under /usr now.
gbs packaging