Revert of Add an option to deferred results to not raise an error (patchset #1 id:1 of https://codereview.chromium.org/828553008/)
Revert of Add an option to deferred results to not raise an error (patchset #1 id:1 of https://codereview.chromium.org/828553008/)

Reason for revert:
Nothing broken, just does not work as intended.  I have no plans to reland this change.

Original issue's description:
> Add an option to deferred results to not raise an error
> 
> Allows access to step results even if the step failed.
> 
> R=smut@google.com, vadimsh@chromium.org, dnj@chromium.org, iannucci@chromium.org, smut@chromium.org
> BUG=
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=293605

TBR=dnj@chromium.org,iannucci@chromium.org,smut@chromium.org,vadimsh@chromium.org,smut@google.com
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/825513004

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@293607 0039d316-1c4b-4281-b951-d872f2087c98

shishkander/recipes-py,luci/recipes-py,shishkander/recipes-py,luci/recipes-py