Update StringIO to use six

It's StringIO.StringIO in python2 and io.StringIO in python3,
but six.StringIO everywhere.

Change-Id: Ief0b091b716e3ea6224c0ac374a6066f0270bebc

jeepyb/cmd/openstackwatch.py

@@ -23,8 +23,8 @@ from __future__ import print_function
 
 __author__ = "Chmouel Boudjnah <chmouel@chmouel.com>"
 
+import six
 from six.moves import configparser
-import cStringIO
 import datetime
 import json
 import os
@@ -127,7 +127,7 @@ def upload_to_swift(content, objectname):
         time.sleep(1)
 
     client.put_object(cfg['container'], objectname,
-                      cStringIO.StringIO(content))
+                      six.StringIO(content))
 
 
 def generate_rss(content, project=""):

jeepyb/cmd/update_blueprint.py

@@ -18,10 +18,10 @@
 # corresponding Launchpad blueprints with links back to the change.
 
 import argparse
+import six
 from six.moves import configparser
 import os
 import re
-import StringIO
 import subprocess
 
 from launchpadlib import launchpad
@@ -54,7 +54,7 @@ def get_broken_config(filename):
         for line in conf.readlines():
             text = "%s%s" % (text, line.lstrip())
 
-    fp = StringIO.StringIO(text)
+    fp = six.StringIO(text)
     c = configparser.ConfigParser()
     c.readfp(fp)
     return c

jeepyb/gerritdb.py

@@ -14,9 +14,9 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+import six
 from six.moves import configparser
 import os
-import StringIO
 
 
 GERRIT_CONFIG = os.environ.get(
@@ -34,7 +34,7 @@ def get_broken_config(filename):
     for line in open(filename, "r"):
         text += line.lstrip()
 
-    fp = StringIO.StringIO(text)
+    fp = six.StringIO(text)
     c = configparser.ConfigParser()
     c.readfp(fp)
     return c