Storwize cinder volume driver have unused error message.

[Jia Ming Zhang]

In the cinder volume Storwize driver, the do_setup will check the iogrp is ready or not. If the io_grp data read have exception raised, there's a legacy 'vdisk_count' which is legacy and unnecessary for this ValueError.
The 'vdisk': iogrp_data['vdisk_count'] should be removed from the message.

[Jia Ming Zhang (jmzhang)]

The code snippet is as following. The iogrp_data['vdisk_count'] should be a legacy variable to be checked but it is no-longer used now.

except ValueError:
                msg = (_('Expected integers for node_count and vdisk_count, '
                         'svcinfo lsiogrp returned: %(node)s and %(vdisk)s') %
                       {'node': iogrp_data['node_count'],
                        'vdisk': iogrp_data['vdisk_count']})

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/65039
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=ae7fcdab7813dbb2e682b00b817e796a9c30a3f8
Submitter: Jenkins
Branch: master

commit ae7fcdab7813dbb2e682b00b817e796a9c30a3f8
Author: Lynxzh <email address hidden>
Date: Mon Jan 6 11:45:33 2014 +0800

    Remove unused message from iogrp_data setup

    The iogrp_data is initialized during do_setup loaded.
    The vdisk_count is originally used but later removed.
    In ValueException raised, the variable is no longer required.
    Remove this will give a clearer message when
    ValueException raised.

    Change-Id: Ib7b6c6a870ddd7932e8da1436d615f9ee458bd93
    Closes-Bug: #1266321