AA: Drop legacy firewall package

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@36841 3c298f89-4303-0410-b956-a3cf2f4a3e73
AA: firewall3: rename to firewall, move into base system menu, update to git head with compatibility fixes for AA

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@36842 3c298f89-4303-0410-b956-a3cf2f4a3e73