Re-write of the cinder-manage man page.
Re-write of the cinder-manage man page.

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

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