Prelabel the init binary with SELinux context.

This change uses the setfiles tool to set an SELinux
context on the init binary when the OS image is built.

BUG=b:25408463
TEST=I built the OS, installed it, and ran ls -Z /sbin/init
CQ-DEPEND=CL:*249719,CL:329413

Change-Id: I9e0748f2e2292c1b91c15a2929f5eb482dc18e9f
Reviewed-on: https://chromium-review.googlesource.com/329184
Commit-Ready: Ricky Zhou <rickyz@chromium.org>
Tested-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Ricky Zhou <rickyz@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed