systemd: let NM-w-o.service require NetworkManager service (rh #1452866)
    
    - systemd: let NM-w-o.service require NetworkManager service (rh #1452866)
      Related to rh #1455704.
      See also: https://github.com/systemd/systemd/pull/6065
    
    - platform: really treat dsa devices as regular wired ethernet (rh #1371289)
      actually apply patch.
    
    - in spec file, explicitly set dhclient as default (resync with upstream
      spec file).