Comment 0 for bug 1642514

This is implemented in linux v4.8 by the following upstream patch:
bf3994d2ed31 ("net/sched: introduce Match-all classifier")

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bf3994d2ed31

The backport is straightforward. It's useful in combination with clsact qdisc (see bug #1642510).