Linux 3.15 rc7

.. and with this, I'm back on my usual Sunday schedule.

It's just a few days after -rc6, but as expected, there were some
pending stuff for when I got back home, so you should think of this as
being the "normal" release, and rc6 just having been oddly delayed by
my travel.

The bulk of this is (by far) the networking changes (mostly drivers),
since most other trees had synced up for rc6, but there are various
smaller things in here too: drm, scheduler, perf, nfsd, afs etc.