Enable autotest client package fetching based on updated image.
The new customization will enable autotest client to fetch a test package
from dev server based on its update url. This could avoid to pre-load all
client packages on stateful partition and shrinked its space from 450M ~ 90M
approximately.
It will only be activated after we add a fetch_location entry in global_config.ini.
Change-Id: I0f57a856b9d78c3245f1ff2a841acd98d6d3717e
BUG=None
TEST=server/autoserv -m IP {client,server}/tests/sleeptest/control --image update_url
carefully read autoserv and client DEBUG log to see packages were downloaded from the dev server.
Review URL: http://codereview.chromium.org/6883099
2 files changed
