Disable IPv6 forwarding on br-client

Disabling forwarding prevents the node from reacting to the Subnet-Router
anycast address.
next-node: remove unused include
next-node: rename config sections
Add gluon-radvd package
Don't accept router advertisements by default
gluon-ebtables-filter-multicast: correct interface name
gluon-core: remove left over 'EOF' from config script
gluon-core: fixup WAN interface MAC address setting
gluon-config-mode: don't depend on haveged

Now that haveged starts before the config mode, there is no need to explicity
depend on it; instead it is just used when specified in the site configuration.
autoupdater: fix usage of /lib/ar71xx.sh
autoupdater: use set -e for safety
autoupdater: Use awk instead of grep+head+tail to split manifest
autoupdater: fix usage of set -e
autoupdater: make cleanup more secure
added gluon-alfred and gluon-alfred-ffmap