Add application support to run under python3.3

Fixed imports for urlparse and iostring libraries usage.

This commit doesn't address updating dependent libraries to python 3
supported versions

Moved to 'six' library for python3.3 support

Closes-Blueprint: python33-support
Change-Id: I624a5c3ef4d3e352574592e0248fe75201d7e780

joker/nodes.py

@@ -3,12 +3,9 @@ import paramiko
 import os
 from paramiko.dsskey import DSSKey
 from paramiko.rsakey import RSAKey
+from six import StringIO
 import stat
 import sys
-if sys.version < '3':
-    from StringIO import StringIO
-else:
-    from io import StringIO
 
 TMP_KEY_PATH = "/tmp/joker_%s_%d"
 

requirements.txt

@@ -16,3 +16,4 @@ paramiko==1.11.0
 oslo.config==1.2.1
 requests==1.2.0
 PyYAML==3.10
+six==1.4.1

rubick/config_formats/ini.py

@@ -1,10 +1,5 @@
 import re
-import sys
-if sys.version < '3':
-    from StringIO import StringIO
-else:
-    from io import StringIO
-
+from six import StringIO
 
 from rubick.config_model import *
 from rubick.config_formats.common import *

rubick/discovery.py

@@ -10,10 +10,10 @@ from recordtype import recordtype
 from rubick.common import index, find, path_relative_to, all_subclasses
 from rubick.exceptions import ValidatorException
 from rubick.model import *
+from six import StringIO
 import shlex
 import stat
 import spur
-from StringIO import StringIO
 import tempfile
 
 

rubick/inspections/keystone_endpoints.py

@@ -1,4 +1,4 @@
-from urlparse import urlparse
+from six.moves.urllib.parse import urlparse
 
 from rubick.common import Inspection, Issue, find
 

webui.py

@@ -1,9 +1,3 @@
-import sys
-if sys.version < '3':
-    from StringIO import StringIO
-else:
-    from io import StringIO
-
 from bson.objectid import ObjectId
 import os.path
 from flask import Flask, request, json, send_file
@@ -11,6 +5,7 @@ from flask_wtf import Form
 from paramiko.dsskey import DSSKey
 from paramiko.rsakey import RSAKey
 from paramiko.ssh_exception import SSHException
+from six import StringIO
 from wtforms import StringField, SelectMultipleField
 from wtforms.validators import DataRequired
 import wtforms_json