Open Stack

This makes it easier to filter them out when looking for wayward 
patches.  Right now the list of 15 oldest reviews includes at least 5 
WIP patches that weren't marked as such in Gerrit.

For anyone who's not aware, to mark a patch WIP in Gerrit you set 
Workflow -1 on it.  Anyone can do that to their own patches, and I 
believe cores can do it to any patch (but I'd rather not because then I 
end up subscribed :-).

Thanks.

-Ben