Remove not longer necessary items from copy_to_system section
Remove not longer necessary items from copy_to_system section

- SSH host keys no longer necessary. See
  https://build.opensuse.org/request/show/396066
- Users database not longer necessary for user import. See
  https://build.opensuse.org/request/show/393918

yast/skelcd-control-SLED,yast/skelcd-control-SLED