Merge branch 'current' of github.com:vyos/vyos-1x into equuleus

• 'current' of github.com:vyos/vyos-1x: T1855, T1826: Restore support for reboot/poweroff in M minutes. vyos.config: T1764: allow for list argument to exists, in value case vyos.config: T1846: ignore edit level when obtaining working config T1843: use include files for interface proxy-arp-pvlan option T1843: use include files for interface proxy-arp configuration T1843: use include files for interface arp-cache-timeout configuration T1843: use include files for interface link-detect feature T1843: use include files for interface MTU size T1843: use include files for interface MAC address T1843: use include files to disable interface (admin down) T1843: use include files for interface description T1843: use include files for DHCP/DHCPv6 options T1843: recursively include IP address definitions in VIF/VIF-S definitions T1843: add support for recursive includes T1843: use include files for VIF/VIF-S interfaces T1843: use include files for IPv4/IPv6 interface address configuration T1843: run interface-definitions though GCC preprocessor