Merge changes I9e940e5b,Iaa27f34a,I2291984c,I95d8ec76

* changes:
  Correctly identify the COPE user for screenshot policy.
  Stop silently eating exceptions in DPMS. This can result in really hard to debug issues.
  Don't supress failures in adopting shell permission identity.
  Remove assumption that COPE profile owner is on profile of system user