tree c75119e6c28dc65973afeb05b3a0eb7c49a332f0
parent 47a7d4e90f57d91567ace49d2de613147cb6eb68
author Chris Sosa <sosa@chromium.org> 1332957890 -0700
committer Gerrit <chrome-bot@google.com> 1332995588 -0700

Make wait_for_status robust against multiple calls at different times.

This change removes the dependency between wait_for_status? and
download? by checking for the staged directory if there is the
equivalent of a "cache" miss from the downloader_dict.

I also clean up a previous assumption in the downlaoder.

BUG=chromium-os:27285
TEST=Unittests + download followed by wait_for_status with
same archive_url and different.  Got all expected results.
Also ran pylint on both devserver and downloader and fixed a cpl
bugs it caught.

Change-Id: I8c187cd64e40c12442de3e4be8fd4c12db7958f3
Reviewed-on: https://gerrit.chromium.org/gerrit/19263
Commit-Ready: Chris Sosa <sosa@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
Tested-by: Chris Sosa <sosa@chromium.org>