Use /usr/bin/python2 in shebangs

Per the pep-0394 recommendation, version specific python scripts should
specify the interpreter version.

TEST=Run tests on a system with python3 default
BUG=None

Change-Id: I83e98f3bb0235230293819104570930085788398
Reviewed-on: https://chromium-review.googlesource.com/251132
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Anatol Pomazau <anatol@google.com>
Commit-Queue: Anatol Pomazau <anatol@google.com>
1 file changed