Can you describe your use case, why you'd like to move the logout URL? Is it because a front-end reverse proxy or something else?
For people who are outside the network they use http://tableau01.datawarehouse.abc to login to the tableau dashboard.
For me it seems like you have a reverse proxy which translates prod.abc domain name to datawarehouse.abc domain.
If this is the case, then check http://onlinehelp.tableausoftware.com/current/server/en-us/proxy.htm or at least set gateway.public.host option