Fix H302 rule after release of oslo.concurrency 0.3.0

'oslo' namespace was removed from oslo.concurency lib and it is now
oslo_concurrency.
Make appropriate change to usage of 'processutils' from oslo concurrency lib
to satisfy pep rule H302.

Change-Id: Ia177c3a1245e5ff33b44216b6d64155d43acba2a

manila/exception.py

@@ -22,8 +22,8 @@ SHOULD include dedicated exception logging.
 
 """
 
-from oslo.concurrency import processutils
 from oslo.config import cfg
+from oslo_concurrency import processutils
 import six
 import webob.exc
 

manila/share/drivers/generic.py

@@ -19,10 +19,10 @@ import os
 import re
 import time
 
-from oslo.concurrency import processutils
 from oslo.config import cfg
 from oslo.utils import excutils
 from oslo.utils import importutils
+from oslo_concurrency import processutils
 import six
 
 from manila.common import constants as const

manila/tests/share/drivers/test_generic.py

@@ -18,8 +18,8 @@
 import os
 
 import mock
-from oslo.concurrency import processutils
 from oslo.config import cfg
+from oslo_concurrency import processutils
 
 from manila.common import constants as const
 from manila import compute

manila/utils.py

@@ -38,11 +38,11 @@ from xml.sax import saxutils
 
 from eventlet import pools
 import netaddr
-from oslo.concurrency import processutils
 from oslo.config import cfg
 from oslo.utils import excutils
 from oslo.utils import importutils
 from oslo.utils import timeutils
+from oslo_concurrency import processutils
 import paramiko
 import six