fix: storage url

x-storage-url is now set in deuce.context through
openstack hook
@raxyu User is not going to be inserting the X-Storage-URL, WSGI middleware or Repose will be. So I see no reason why if we're using the OpenStack hook that we could not just insert it too.

I don't think we want to provide Repose or the WSGI Middleware with logic on when to include it and when not to. Easiest to just require it all the time there.

Alternatively, the hook could check the Deuce configuration and determine if the Swift driver was loaded and only try to insert it in that use-case.

FWIW, I'm undecided about whether to have the X-Storage-URL inserted by the middleware or whether to just have the hook search the Service Catalog (the whole thing is coming) and choose which one to insert itself. With the EOM.auth middleware I'm working on it'll be just as fast to do it in the hook as it would in the middleware since they could very well be in the same process.