Revert "docker.py: Python 2.6 argparse compatibility"

This reverts commit c2d3189667409561772e8c1e5615c5166cd8aa2c.

scripts/argparse.py was removed from the tree, so we don't need
this hack anymore.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20180618225131.13113-3-ehabkost@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

tests/docker/docker.py

@@ -14,14 +14,12 @@
 from __future__ import print_function
 import os
 import sys
-sys.path.append(os.path.join(os.path.dirname(__file__),
-                             '..', '..', 'scripts'))
-import argparse
 import subprocess
 import json
 import hashlib
 import atexit
 import uuid
+import argparse
 import tempfile
 import re
 import signal