Drop legacy firewall package

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36837 3c298f89-4303-0410-b956-a3cf2f4a3e73
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/trunk@36838 3c298f89-4303-0410-b956-a3cf2f4a3e73
firewall: fix git source url

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36839 3c298f89-4303-0410-b956-a3cf2f4a3e73
firewall3: fix accidentally changed install directive

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36840 3c298f89-4303-0410-b956-a3cf2f4a3e73