init: Migrate /var/empty to /mnt/empty.
This helps avoid races during chromeos_startup and eliminates the need
for /var/empty to be set immutable.
BUG=chromium:933582
TEST=PreCQ passes
Change-Id: Iecc412fad58f77b7c3f300c2b4b34065111dd498
Reviewed-on: https://chromium-review.googlesource.com/1508836
Commit-Ready: Allen Webb <allenwebb@google.com>
Tested-by: Allen Webb <allenwebb@google.com>
Reviewed-by: Christopher Morin <cmtm@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed
