move clean.py into keystone/common

The clean.py file was used by certain keystone services (identity
and resource). Common should house items that are common to the
services we offer.

Change-Id: I39041e3171312b5aadfab4c7d3cfb903fe9dafe6

keystone/identity/backends/ldap.py

@@ -20,7 +20,7 @@ from oslo_config import cfg
 from oslo_log import log
 import six
 
-from keystone import clean
+from keystone.common import clean
 from keystone.common import driver_hints
 from keystone.common import ldap as common_ldap
 from keystone.common import models

keystone/identity/core.py

@@ -23,8 +23,8 @@ from oslo_config import cfg
 from oslo_log import log
 import six
 
-from keystone import clean
 from keystone.common import cache
+from keystone.common import clean
 from keystone.common import dependency
 from keystone.common import driver_hints
 from keystone.common import manager

keystone/resource/backends/ldap.py

@@ -17,7 +17,7 @@ import uuid
 from oslo_config import cfg
 from oslo_log import log
 
-from keystone import clean
+from keystone.common import clean
 from keystone.common import driver_hints
 from keystone.common import ldap as common_ldap
 from keystone.common import models

keystone/resource/backends/sql.py

@@ -13,7 +13,7 @@
 from oslo_config import cfg
 from oslo_log import log
 
-from keystone import clean
+from keystone.common import clean
 from keystone.common import sql
 from keystone import exception
 from keystone.i18n import _LE

keystone/resource/core.py

@@ -18,8 +18,8 @@ from oslo_config import cfg
 from oslo_log import log
 import six
 
-from keystone import clean
 from keystone.common import cache
+from keystone.common import clean
 from keystone.common import dependency
 from keystone.common import driver_hints
 from keystone.common import manager