grizzly: add document for Huawei cinder volume driver

[zhangchao]

Huawei cinder volume driver has been mergered to grizzly.

https://review.openstack.org/#/c/21100/

There needs document to describe how to use this driver.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/25312

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/25313

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/25313
Committed: http://github.com/openstack/openstack-manuals/commit/e1d5e167f0a02bde43485a352fe3b069b359fc3a
Submitter: Jenkins
Branch: master

commit e1d5e167f0a02bde43485a352fe3b069b359fc3a
Author: zhangchao010 <email address hidden>
Date: Tue Mar 26 01:58:58 2013 +0800

    Add document for Huawei cinder volume driver

    Add configuration guide for Huawei cinder volume drive
    in computevolumes.xml.

    Fixes bug: 1159842

    Patchset moves it to the block storage admin guide as a
    file in the drivers directory.

    Change-Id: Ia1953b7ad78d0428a0cdd16ee3569f379d289d3e