The cinder-manage man page didn't appear to have been re-written
since splitting from Nova. There were numerous options that
no longer exist documented and references to Nova instead of
Cinder.
This version has been re-written based on the current code in
cinder-manage.
(fixes bug 1174502)
Change-Id: Ia03ca05bbd87444b2213bf719da0ffff96b67699