Make jenkins job fail when exception is caught

We have to return something non zero for it to know it didn't work

Change-Id: Ic4bc525fa660f03b8a2bd64058849d861e5c11ee
Config can include extra places to check for already-downloaded files

Change-Id: If8bc9451aa079d6bf3af6ab5b7869551ee70c996
complain about empty files after work is complete.  default to not panic.

Change-Id: I90025d5404f6f3f0926a60e91fac669c6c214401
fix double typo

Change-Id: I8ec331c45604b8ca70ed9791a2697e787e2c7a1a
Merge "complain about empty files after work is complete.  default to not panic."
Merge "fix double typo"
Merge remote-tracking branch 'origin/master' into HEAD

Change-Id: I84f752ea3cfc7a07e6439ac21782f1f9a4d187ef