netfilter: add support for flushing conntrack via /proc

Backport of r35330

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@35331 3c298f89-4303-0410-b956-a3cf2f4a3e73
AA: firewall: backport r35348


git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@35350 3c298f89-4303-0410-b956-a3cf2f4a3e73
AA: feeds: switch to LuCI v0.11.1 tag


git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@35351 3c298f89-4303-0410-b956-a3cf2f4a3e73
netifd: update to latest version, fixes setting addresses/routes on alias interfaces

Backport of r35362

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@35363 3c298f89-4303-0410-b956-a3cf2f4a3e73