python3: Add basic compatibility support

Use six.iteritems to replace dictionary.iteritems() on python2 or
dictionary.items() on python3.

Change-Id: I623009200f3a90985a2c0178673df7d54b36a686
Signed-off-by: Chuck Short <chuck.short@canonical.com>

keystoneclient/contrib/ec2/utils.py

@@ -24,6 +24,8 @@ import hmac
 import re
 import urllib
 
+import six
+
 
 class Ec2Signer(object):
     """
@@ -211,7 +213,7 @@ class Ec2Signer(object):
             # - the Authorization header (SignedHeaders key)
             # - the X-Amz-SignedHeaders query parameter
             headers_lower = dict((k.lower().strip(), v.strip())
-                                 for (k, v) in headers.iteritems())
+                                 for (k, v) in six.iteritems(headers))
 
             # Boto versions < 2.9.3 strip the port component of the host:port
             # header, so detect the user-agent via the header and strip the

keystoneclient/generic/shell.py

@@ -18,6 +18,8 @@
 from keystoneclient.generic import client
 from keystoneclient import utils
 
+import six
+
 CLIENT_CLASS = client.Client
 
 
@@ -45,13 +47,13 @@ def do_discover(cs, args):
     if versions:
         if 'message' in versions:
             print(versions['message'])
-        for key, version in versions.iteritems():
+        for key, version in six.iteritems(versions):
             if key != 'message':
                 print ("    - supports version %s (%s) here %s" %
                        (version['id'], version['status'], version['url']))
                 extensions = cs.discover_extensions(version['url'])
                 if extensions:
-                    for key, extension in extensions.iteritems():
+                    for key, extension in six.iteritems(extensions):
                         if key != 'message':
                             print ("        - and %s: %s" %
                                    (key, extension))

keystoneclient/middleware/auth_token.py

@@ -154,6 +154,8 @@ import tempfile
 import time
 import urllib
 
+import six
+
 from keystoneclient.common import cms
 from keystoneclient.middleware import memcache_crypt
 from keystoneclient.openstack.common import jsonutils
@@ -843,7 +845,7 @@ class AuthProtocol(object):
 
     def _add_headers(self, env, headers):
         """Add http headers to environment."""
-        for (k, v) in headers.iteritems():
+        for (k, v) in six.iteritems(headers):
             env_key = self._header_to_env_var(k)
             env[env_key] = v
 

keystoneclient/v2_0/shell.py

@@ -19,6 +19,8 @@ import argparse
 import getpass
 import sys
 
+import six
+
 from keystoneclient import utils
 from keystoneclient.v2_0 import client
 
@@ -440,7 +442,7 @@ def do_ec2_credentials_delete(kc, args):
 def do_catalog(kc, args):
     """List service catalog, possibly filtered by service."""
     endpoints = kc.service_catalog.get_endpoints(service_type=args.service)
-    for (service, service_endpoints) in endpoints.iteritems():
+    for (service, service_endpoints) in six.iteritems(endpoints):
         if len(service_endpoints) > 0:
             print("Service: %s" % service)
             for ep in service_endpoints: