Datera volume throws exception with invalid parameter name

[Earle F. Philhower, III]

In cinder/volume/driver/datera.py it throws a VolumeDriverException with a named parameter "msg". The parameter name should be "message"

...snip...
    def _wait_for_resource(self, id, resource_type):
        result = self._issue_api_request(resource_type, 'get', id)
        if result['status'] == 'available':
            return
        else:
> raise exception.VolumeDriverException(msg=_('Resource not ready.'))

Should be
> raise exception.VolumeDriverException(message=_('Resource not ready.'))

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/188606

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/188606
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=339a74ca918c42b0ea04cc9821d2860f16c67868
Submitter: Jenkins
Branch: master

commit 339a74ca918c42b0ea04cc9821d2860f16c67868
Author: Earle F. Philhower, III <email address hidden>
Date: Thu Jun 4 14:57:50 2015 -0700

    Fix exception parameter name

    Trivial fix for an exception parameter being passed in via the
    wrong named parameter.

    Change-Id: I55cb8b181dea58b7feea8f715ae06942d6e4c784
    Closes-Bug: 1462096