Updated openstack/openstack
Project: openstack/horizon  2bcf9b42e8c765b627ea5b92a0c9acf5ab292ac7

set max_length on volume/snapshot description text area

Currently, there is no max, but will close the modal and give
the generic "Unable to update volume." This is a preventable
error if we restrict to 255 chars to match Cinder.

Change-Id: I50e63929ed70dd7a899b7d157381d1f5ad2356cd
Closes-Bug: #1370186