Allow user to view outputs of failed stacks

Outputs like 'stderr' are designed for users to debug failed stacks, if
users can not view outputs of failed stacks, they can not get the error
messages.

Change-Id: I1b2b4f0e967695cf3297d93022cecec958e94b24
Closes-Bug: #1333208
Merge "Allow user to view outputs of failed stacks"