enter_chroot.sh: use GCE boto.cfg

BUG=chromium:589892
TEST=cros_sdk

Change-Id: Icfb14a9fe8a715ff33d7d875285f4ea3b94b95db
Reviewed-on: https://chromium-review.googlesource.com/329423
Commit-Ready: David Riley <davidriley@chromium.org>
Tested-by: David Riley <davidriley@chromium.org>
Reviewed-by: David Riley <davidriley@chromium.org>
1 file changed