Tar only the necessary files for autotest

Tar only the control files and the packages in the autotest tarball. Keep both
tarred-only (autotest.tar) and zipped (autotest.tar.bz2) for backward
compatibiliy. The zipped tarball is to be removed after all other changes are
done.

BUG=chromium-os:32312
TEST=remote trybot + hw testing

Change-Id: I1cd0e3c029cfd0a9fa27f981b68ba2958c94dec1
Reviewed-on: https://gerrit.chromium.org/gerrit/26612
Commit-Ready: Yu-Ju Hong <yjhong@chromium.org>
Tested-by: Yu-Ju Hong <yjhong@chromium.org>
Reviewed-by: Yu-Ju Hong <yjhong@chromium.org>
3 files changed