Remove __future__ import from cts scripts

The scripts are already using Python 3. No need to support Python 2.

BUG=chromium:1031760
TEST=None

Change-Id: Ifba8de3cf12081c0c2e3bc3a471ad257423501da
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crostestutils/+/1959083
Tested-by: Greg Edelston <gredelston@google.com>
Reviewed-by: Rohit Makasana <rohitbm@chromium.org>
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Commit-Queue: Greg Edelston <gredelston@google.com>
3 files changed