[init] Migrate to /run.

In preparation for a udev uprev, we need to mount /run as a tmpfs as one
of the first things we do in the boot process.  /run is meant to replace
/var/run and related temporary storage areas, so we also symlink a
couple directories to their new names in /run.

CQ-DEPEND=Ia5d124ba81997ba40c6c6a822c22bb5c90f1b613
BUG=chromium:320868
TEST=lumpy still boots

Change-Id: If98e9b956536e1b35e22cb9ecb19fdd14974735a
Reviewed-on: https://chromium-review.googlesource.com/186240
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Steve Fung <stevefung@chromium.org>
Commit-Queue: Steve Fung <stevefung@chromium.org>
3 files changed