odhcp6c: some more fixes for map / lw4o6 support

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40728 3c298f89-4303-0410-b956-a3cf2f4a3e73
igmpproxy: move to trunk, add myself as maintainer

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40730 3c298f89-4303-0410-b956-a3cf2f4a3e73