Draft: use containers keyword where applicable
- main/busybox-initscripts: use the -containers keyword
- main/eudev: use -containers keyword
- main/kbd: use -containers keyword
- main/kmod: use -containers keyword
- main/openrc: use -containers keyword
- testing/mdevd: use only -containers, -vserver and -lxc are part of it
- community/ifstate: use -containers keyword
- main/macifrename: use -containers keyword