Remove six from api module

This is part of the steps to remove usage of six library, which is no
longer needed since python 2 support was removed.

Change-Id: I4c80bdf8f90a920a05f051a922dfb5db925f0649

magnum/api/controllers/base.py

@@ -14,7 +14,6 @@
 
 import datetime
 import operator
-import six
 
 from magnum.api.controllers import versions
 from magnum.api import versioned_method
@@ -90,8 +89,7 @@ class ControllerMetaclass(type):
                                                        cls_dict)
 
 
-@six.add_metaclass(ControllerMetaclass)
-class Controller(rest.RestController):
+class Controller(rest.RestController, metaclass=ControllerMetaclass):
     """Base Rest Controller"""
 
     def __getattribute__(self, key):

magnum/api/controllers/v1/cluster.py

@@ -19,7 +19,6 @@ from oslo_log import log as logging
 from oslo_utils import strutils
 from oslo_utils import timeutils
 import pecan
-import six
 import warnings
 import wsme
 from wsme import types as wtypes
@@ -92,10 +91,10 @@ class Cluster(base.APIBase):
     docker_volume_size = wtypes.IntegerType(minimum=1)
     """The size in GB of the docker volume"""
 
-    labels = wtypes.DictType(wtypes.text, types.MultiType(wtypes.text,
-                                                          six.integer_types,
-                                                          bool,
-                                                          float))
+    labels = wtypes.DictType(
+        wtypes.text,
+        types.MultiType(wtypes.text, int, bool, float)
+    )
     """One or more key/value pairs"""
 
     master_flavor_id = wtypes.StringType(min_length=1, max_length=255)
@@ -167,17 +166,19 @@ class Cluster(base.APIBase):
 
     labels_overridden = wtypes.DictType(
             wtypes.text, types.MultiType(
-                wtypes.text, six.integer_types, bool, float))
+                wtypes.text, int, bool, float))
     """Contains labels that have a value different than the parent labels."""
 
     labels_added = wtypes.DictType(
-            wtypes.text, types.MultiType(
-                wtypes.text, six.integer_types, bool, float))
+        wtypes.text,
+        types.MultiType(wtypes.text, int, bool, float)
+    )
     """Contains labels that do not exist in the parent."""
 
     labels_skipped = wtypes.DictType(
-            wtypes.text, types.MultiType(
-                wtypes.text, six.integer_types, bool, float))
+        wtypes.text,
+        types.MultiType(wtypes.text, int, bool, float)
+    )
     """Contains labels that exist in the parent but were not inherited."""
 
     master_lb_enabled = wsme.wsattr(types.boolean)

magnum/api/controllers/v1/cluster_template.py

@@ -15,7 +15,6 @@
 from oslo_log import log as logging
 from oslo_utils import timeutils
 import pecan
-import six
 import warnings
 import wsme
 from wsme import types as wtypes
@@ -117,10 +116,10 @@ class ClusterTemplate(base.APIBase):
     registry_enabled = wsme.wsattr(types.boolean, default=False)
     """Indicates whether the docker registry is enabled"""
 
-    labels = wtypes.DictType(wtypes.text, types.MultiType(wtypes.text,
-                                                          six.integer_types,
-                                                          bool,
-                                                          float))
+    labels = wtypes.DictType(
+        wtypes.text,
+        types.MultiType(wtypes.text, int, bool, float)
+    )
     """One or more key/value pairs"""
 
     tls_disabled = wsme.wsattr(types.boolean, default=False)

magnum/api/controllers/v1/nodegroup.py

@@ -14,7 +14,6 @@
 #    under the License.
 
 import pecan
-import six
 import uuid
 import wsme
 from wsme import types as wtypes
@@ -80,10 +79,10 @@ class NodeGroup(base.APIBase):
     docker_volume_size = wtypes.IntegerType(minimum=1)
     """The size in GB of the docker volume"""
 
-    labels = wtypes.DictType(wtypes.text, types.MultiType(wtypes.text,
-                                                          six.integer_types,
-                                                          bool,
-                                                          float))
+    labels = wtypes.DictType(
+        wtypes.text,
+        types.MultiType(wtypes.text, int, bool, float)
+    )
     """One or more key/value pairs"""
 
     links = wsme.wsattr([link.Link], readonly=True)
@@ -130,18 +129,21 @@ class NodeGroup(base.APIBase):
     """Indicates whether the labels will be merged with the cluster labels."""
 
     labels_overridden = wtypes.DictType(
-            wtypes.text, types.MultiType(
-                wtypes.text, six.integer_types, bool, float))
+        wtypes.text,
+        types.MultiType(wtypes.text, int, bool, float)
+    )
     """Contains labels that have a value different than the parent labels."""
 
     labels_added = wtypes.DictType(
-            wtypes.text, types.MultiType(
-                wtypes.text, six.integer_types, bool, float))
+        wtypes.text,
+        types.MultiType(wtypes.text, int, bool, float)
+    )
     """Contains labels that do not exist in the parent."""
 
     labels_skipped = wtypes.DictType(
-            wtypes.text, types.MultiType(
-                wtypes.text, six.integer_types, bool, float))
+        wtypes.text,
+        types.MultiType(wtypes.text, int, bool, float)
+    )
     """Contains labels that exist in the parent but were not inherited."""
 
     def __init__(self, **kwargs):

magnum/api/controllers/v1/types.py

@@ -14,7 +14,6 @@
 #    under the License.
 
 import inspect
-import six
 
 from oslo_utils import strutils
 from oslo_utils import uuidutils
@@ -29,7 +28,7 @@ from magnum.i18n import _
 class DNSListType(wtypes.UserType):
     """A comman delimited dns nameserver list"""
 
-    basetype = six.string_types
+    basetype = str
     name = "dnslist"
 
     @staticmethod