[dhcp] (2 commits) ...convert DHC*ARGS from /etc/sysconfig/dhc* to service unit

[Jiří Popelka]

Summary of changes:

  e812a0f... 12-dhcpd NM dispatcher script now restarts also dhcpd6 serv (*)
  dd39224... convert DHC*ARGS from /etc/sysconfig/dhc* to service unit (*)

(*) This commit already existed in another branch; no separate mail sent