Python3: Use six.moves for py2 compatibility

Use 'range', 'reduce', 'map', 'cStringIO' from six.moves
for python3 compatibility.

Blueprint murano-python-3-support

Change-Id: I823c44d51db72ddb30a14f5755d781eca0d91e50

murano/dsl/helpers.py

@@ -24,6 +24,7 @@ import eventlet.greenpool
 import eventlet.greenthread
 import semantic_version
 import six
+from six.moves import reduce
 import yaql.language.exceptions
 import yaql.language.expressions
 from yaql.language import utils as yaqlutils

murano/dsl/macros.py

@@ -14,6 +14,7 @@
 
 
 import six
+from six.moves import range
 
 from murano.dsl import constants
 from murano.dsl import dsl_exception

murano/dsl/murano_class.py

@@ -17,6 +17,7 @@ import weakref
 
 import semantic_version
 import six
+from six.moves import range
 from yaql.language import utils
 
 from murano.dsl import constants

murano/dsl/yaql_functions.py

@@ -12,8 +12,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import itertools
-
 import eventlet
 import six
 from yaql.language import specs
@@ -75,7 +73,7 @@ def super_(context, sender, func=None):
     if func is None:
         return [sender.cast(type) for type in cast_type.parents(
             sender.real_this.type)]
-    return itertools.imap(func, super_(context, sender))
+    return six.moves.map(func, super_(context, sender))
 
 
 @specs.parameter('value', dsl_types.MuranoObject)

murano/engine/system/yaql_functions.py

@@ -18,6 +18,7 @@ import collections
 import random
 import re
 import six
+from six.moves import range
 import string
 import time
 

murano/tests/unit/api/v1/test_catalog.py

@@ -14,7 +14,6 @@
 # limitations under the License.
 
 import cgi
-import cStringIO
 import imghdr
 import json
 import os
@@ -22,6 +21,8 @@ import uuid
 
 import mock
 from oslo_utils import timeutils
+from six.moves import cStringIO
+from six.moves import range
 
 from murano.api.v1 import catalog
 from murano.db.catalog import api as db_catalog_api
@@ -497,7 +498,7 @@ class TestCatalogApi(test_base.ControllerTest, test_base.MuranoApiTestCase):
         self.expect_policy_check('upload_package')
         self.expect_policy_check('publicize_package')
 
-        file_obj_str = cStringIO.StringIO("This is some dummy data")
+        file_obj_str = cStringIO("This is some dummy data")
         file_obj = mock.MagicMock(cgi.FieldStorage)
         file_obj.file = file_obj_str
         package_from_dir, _ = self._test_package()

murano/tests/unit/db/test_catalog.py

@@ -14,6 +14,7 @@
 import uuid
 
 from oslo_db import exception as db_exception
+from six.moves import range
 from webob import exc
 
 from murano.db.catalog import api

murano/tests/unit/dsl/foundation/object_model.py

@@ -12,6 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from six.moves import range
+
 from murano.dsl import helpers