
Leverage the new cliff command class attribute (_description) to get the help of a command, this allows us to mark strings for translation[1]. We could not do this before since the help was grabbed from the docstring. The old help strings are still left to keep backward compatible. [1]:https://review.openstack.org/#/c/397321/ Co-Authored-By: wanghao <sxmatch1986@gmail.com> Change-Id: If9c6009eee4dbee87deda8aba63db088ced4f014