AA: netifd: Backport r36903

git-svn-id: svn://svn.openwrt.org/openwrt@36905 3c298f89-4303-0410-b956-a3cf2f4a3e73
AA: ppp: Backport r35188, r36904

git-svn-id: svn://svn.openwrt.org/openwrt@36906 3c298f89-4303-0410-b956-a3cf2f4a3e73