Leverage openstack.common.importutils import_class

This patch drops the import_class method from utils and instead
leverages the one in openstack.common.importutils.

Change-Id: I9f740b9941d477776597c4c4ab88a65a39fb4fb8
Closes-bug: 1365273

cinderclient/client.py

@@ -30,7 +30,6 @@ import requests
 from cinderclient import exceptions
 from cinderclient.openstack.common import importutils
 from cinderclient.openstack.common import strutils
-from cinderclient import utils
 
 osprofiler_web = importutils.try_import("osprofiler.web")
 
@@ -526,7 +525,7 @@ def get_client_class(version):
             (version, ', '.join(version_map)))
         raise exceptions.UnsupportedVersion(msg)
 
-    return utils.import_class(client_path)
+    return importutils.import_class(client_path)
 
 
 def Client(version, *args, **kwargs):

cinderclient/utils.py

@@ -249,13 +249,6 @@ def safe_issubclass(*args):
     return False
 
 
-def import_class(import_str):
-    """Returns a class from a string including module and class."""
-    mod_str, _sep, class_str = import_str.rpartition('.')
-    __import__(mod_str)
-    return getattr(sys.modules[mod_str], class_str)
-
-
 def _load_entry_point(ep_name, name=None):
     """Try to load the entry point ep_name that matches name."""
     for ep in pkg_resources.iter_entry_points(ep_name, name=name):