netifd: Introduce native IPv6 prefix-handling

git-svn-id: svn://svn.openwrt.org/openwrt@35167 3c298f89-4303-0410-b956-a3cf2f4a3e73
base-files: add support for ipv6-prefixes in connection with netifd

git-svn-id: svn://svn.openwrt.org/openwrt@35168 3c298f89-4303-0410-b956-a3cf2f4a3e73
6distributed: Remove obsolete service (replaced by netifd)

git-svn-id: svn://svn.openwrt.org/openwrt@35169 3c298f89-4303-0410-b956-a3cf2f4a3e73
6relayd: add suitable default configuration

git-svn-id: svn://svn.openwrt.org/openwrt@35170 3c298f89-4303-0410-b956-a3cf2f4a3e73
6in4: add support for native IPv6 prefix handling

git-svn-id: svn://svn.openwrt.org/openwrt@35171 3c298f89-4303-0410-b956-a3cf2f4a3e73