Provide cinder CLI man page.

Provide basic but hopefully useful man page.

shell.rst was merged into and replaced by the man page in HTML docs.

pbr is used to determine version.

Docs copyright was changed to more accurate "OpenStack Contributors".

Fixes: bug 1206968
Implements: blueprint clients-man-pages
Change-Id: Iedd7b4b161ced564833fd9433762b87a4c1a374d
Sync with global requirements

Change-Id: Iccc824fef7dc7ae5675d6528a1ea33566e5f7eef
Merge "Sync with global requirements"