Sync from oslo-incubator

Sync from oslo-incubator contains various python3 fixes.

Change-Id: I55e867450d65d9fa74fd6ef6ffece2bbb9f929cf
Signed-off-by: Chuck Short <chuck.short@canonical.com>

glanceclient/openstack/common/importutils.py

@@ -41,8 +41,9 @@ def import_object(import_str, *args, **kwargs):
 
 
 def import_object_ns(name_space, import_str, *args, **kwargs):
-    """
-    Import a class and return an instance of it, first by trying
+    """Tries to import object from default namespace.
+
+    Imports a class and return an instance of it, first by trying
     to find the class in a default namespace, then failing back to
     a full path if not found in the default namespace.
     """