Updated openstack/openstack
Project: openstack/heat  336d739486fffbd6034f48d7042f355bacaa2758

Fix client exception handling in VolumeExtendTask

This class was not ported correctly to use new is_client_exception
method of client_plugin.

Change-Id: I2982c369b4379894d0a50eeae90cb7620bb6f7d9