Allow description to be set for service create/update

[Lin Hua Cheng]

For keystone V3, the description field is not exposed for create and update service. It is available in the V2 API though.

Service still have Description available as part of its attribute, based on the spec: http://specs.openstack.org/openstack/keystone-specs/api/v3/identity-api-v3.html#services-v3-services

$ export OS_IDENTITY_API_VERSION=3
$ export OS_AUTH_URL=http://localhost:5000/v3

And adding:
$ export OS_PROJECT_DOMAIN_ID=default
$ export OS_USER_DOMAIN_ID=default

usage: service create [-h] [-f {html,json,shell,table,value,yaml}] [-c COLUMN]
                      [--max-width <integer>] [--prefix PREFIX]
                      [--name <service-name>] [--enable | --disable]
                      <service-type>

Description should be exposed for update as well

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/143558
Committed: https://git.openstack.org/cgit/openstack/python-openstackclient/commit/?id=36ab944d2ecac5227880a6b09b4184bff4c0aba8
Submitter: Jenkins
Branch: master

commit 36ab944d2ecac5227880a6b09b4184bff4c0aba8
Author: lin-hua-cheng <email address hidden>
Date: Mon Dec 22 15:09:09 2014 -0800

    Allow service description to be set for KS V3

    Change-Id: Ibf84882c9a9f408268c225190436fc1a534e1017
    Closes-Bug: #1404997