Make sure sudo never prompt for password when rebooting.
Make sure sudo never prompt for password when rebooting.

This will cause a hang, this is not what we want.
Verified both OSX and Ubuntu version of sudo supports -n.

R=kjlubick@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1647173002

luci/luci-py,luci/luci-py,luci/luci-py,luci/luci-py