tests: Move tap-driver.sh out of the autotools aux directory

We have made local modifications to this script, move it to the test
suite directory so it doesn't get overwritten by an updated version from
autotools.

This is part of an effort to standardise our autotools setup across
project to simplify maintenance.

Change-Id: I4bc0bdbff05d03d8e4c0f9dcda51cf6a6cf7fec4
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>