Remove usage of obsolete oslo.exception

Change-Id: I6f46f90bd74cc26fc01667e467e3dab38037eec3
Closes-Bug: #1208734

cinder/api/extensions.py

@@ -26,7 +26,6 @@
 from cinder.api.openstack import wsgi
 from cinder.api import xmlutil
 from cinder import exception
-from cinder.openstack.common import exception as common_exception
 from cinder.openstack.common import importutils
 from cinder.openstack.common import log as logging
 import cinder.policy
@@ -373,7 +372,7 @@ def load_standard_extensions(ext_mgr, logger, path, package, ext_list=None):
                         (package, relpkg, dname))
             try:
                 ext = importutils.import_class(ext_name)
-            except common_exception.NotFound:
+            except ImportError:
                 # extension() doesn't exist on it, so we'll explore
                 # the directory for ourselves
                 subdirs.append(dname)

cinder/exception.py

@@ -29,7 +29,6 @@
 from oslo.config import cfg
 import webob.exc
 
-from cinder.openstack.common import exception as com_exception
 from cinder.openstack.common import log as logging
 
 
@@ -78,7 +77,8 @@ def __init__(self, stdout=None, stderr=None, exit_code=None, cmd=None,
         IOError.__init__(self, message)
 
 
-Error = com_exception.Error
+class Error(Exception):
+    pass
 
 
 class CinderException(Exception):

openstack-common.conf

@@ -4,7 +4,6 @@
 module=context
 module=db
 module=db.sqlalchemy
-module=exception
 module=excutils
 module=fileutils
 module=flakes