Replace six.iteritems() with .items()

1.As mentioned in [1], we should avoid using
six.iteritems to achieve iterators. We can
use dict.items instead, as it will return
iterators in PY3 as well. And dict.items/keys
will more readable. 2.In py2, the performance
about list should be negligible, see the link [2].
[1] https://wiki.openstack.org/wiki/Python3
[2] http://lists.openstack.org/pipermail/openstack-dev/2015-June/066391.html

Change-Id: I1ca4470fe8aae2098899b3f7ed29f83b56d57f79

blazar/api/v1/validation.py

@@ -15,8 +15,6 @@
 
 import functools
 
-import six
-
 from blazar.api.v1 import utils as api_utils
 from blazar import exceptions
 
@@ -41,7 +39,7 @@ def check_exists(get_function, object_id=None, **get_args):
             """Decorator handler."""
 
             get_kwargs = {}
-            for k, v in six.iteritems(get_args):
+            for k, v in get_args.items():
                 get_kwargs[k] = kwargs[v]
 
             try:

blazar/manager/service.py

@@ -18,7 +18,6 @@ import datetime
 import eventlet
 from oslo_config import cfg
 from oslo_log import log as logging
-import six
 from stevedore import enabled
 
 from blazar.db import api as db_api
@@ -106,7 +105,7 @@ class ManagerService(service_utils.RPCServer):
         """
         actions = {}
 
-        for resource_type, plugin in six.iteritems(self.plugins):
+        for resource_type, plugin in self.plugins.items():
             plugin = self.plugins[resource_type]
             CONF.register_opts(plugin.get_plugin_opts(), group=resource_type)