Modify the way we skip package fetching from autoserv.

This change is a re-implementation of fetch_from_autoserv that
follows more closely to the original fall-back i.e. just failing.
There seems to be a hidden dependency that handles not fetching
files from autoserv correctly rather than not having a Fetcher.

BUG=chromium-os:34788
TEST=Ran sleeptest with/without setting set in global_config and
deleting the local cached package and running again with/without
setting. Also ran pylint using utils/run_pylint.

Change-Id: I1bc803b52daab02f38fa8a52c3a0b0efa7754649
Reviewed-on: https://gerrit.chromium.org/gerrit/34665
Tested-by: Chris Sosa <sosa@chromium.org>
Reviewed-by: Simran Basi <sbasi@chromium.org>
Commit-Ready: Brian Harring <ferringb@chromium.org>
1 file changed