Fix stack-show on a TemplateResource with outputs

TemplateResource currently tries to re-download the template.
this is not good, esp. if you have a relative path to a local file.
First see if we have a new template, if not look in the db.

Closes-bug: #1252980
Change-Id: If819aab9ed1360744f8e73f0b6409641e2d8114f
Merge "Fix stack-show on a TemplateResource with outputs"