Fix minor bugs in the "Resize Instance" workflow

The name of the instance on success was always "unknown instance",
because the name attribute wasn't getting populated in the context,
and the text of the success message was wrong.  Success of this
action is successfully STARTING to resize.  There's still a
confirmation step.

Fixes Bug: 1210692

Change-Id: Ie8361fa222940e1ff02b581a3058a49ac16639d2
Merge "Fix minor bugs in the "Resize Instance" workflow"