init: use more namespaces

This process only needs to monitor /dev/watchdog and log things, so
it doesn't need access to existing namespaces.  Lock them down.

BUG=None
TEST=daisydog still starts & watches, and it runs in unique namespaces

Change-Id: Ic098c271f5700a9d4101964a3560c65d29a96088
Reviewed-on: https://chromium-review.googlesource.com/392387
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
1 file changed