Use ELEMENTS_PATH instead of copying elements

Change-Id: I1c6d059482cdf958b2d89063b501a44e4737e3a8
Remove dead DIB sudoers code

This script uses features of DIB that were added after DIB stopped
using sudoers.

Change-Id: Ia696948a71ed6bc1d187c2b262bb4baa45406714
Simpler way to get repo SHA

Change-Id: I65a92c36e3338de65d7a5eeb9b288d6665c4e365