Add the scripts/ directory to sys.path so Python 2.6 will be able to
import argparse.

Cc: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Acked-by: NJohn Snow <jsnow@redhat.com>
Acked-by: NFam Zheng <famz@redhat.com>
Message-id: 20170825155732.15665-4-stefanha@redhat.com
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>