OPNSense/core db4833e — . plist, src/etc/inc interfaces.inc
interfaces: ppp-related changes from master (cherry picked from commit cfc95122f2d248e61d03d8f1dbae3cbd40260196) (cherry picked from commit 75c3100ba7fca08e874dfea7b40831781bdf7f74) (cherry picked from commit be9a1c94ab0a96d7c3a1f94eedaa4c88c5275639)