Linux 4.16 rc7

So after a couple of pretty small rc's, rc7 is much too big for my
taste.  By this time in the release, things should have calmed down
more than they apparently have.

That said, I do blame most of it on the timing variation, notably how
rc6 didn't have any networking updates in it, and the rc5 network pull
was right after the rc4 release. As a result, we have 2.5 weeks worth
of networking stuff, and that makes rc7 look artificially bigger.

That's my story, and I'm sticking to it.