Remove version endpoint in Glance

This is wrong, and people keep doing this and bugging the Ceilometer folks
about Ceilometer being bugged, whereas it just follows what it is told.

Change-Id: I9f5c9d6a48a07b0fe64e9402d06ad4c4aa5bdccb
Signed-off-by: Julien Danjou <julien@danjou.info>
Merge "Remove version endpoint in Glance" into stable/grizzly