Perform image show early in the resize process
Perform image show early in the resize process

This change addresses bug 943421 by performing glance interactions
much earlier in the resize process. This prevents token expiration
from breaking resizes.

- added a comment to the compute api change to give some context and
  help prevent regression on this bug

Change-Id: I21619f9f6189d5bdec64de47988985cbc3b8016d

n0ano/gantt,n0ano/gantt