Tests: standardize TAP_AUTOTIME parsing in python

Disable TAP autotime only when 'TAP_AUTOTIME == 0'. Also remove the
version check as we don't support Python <= 3.3 and there is already an
assertion in the code.

Change-Id: Idf8badb5a27b1a01cbe7c230495eec342b9c3878
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>