Updated openstack/openstack
Project: openstack/nova  70b2903d02399edb8c0f5a6f6663d5604f95e456
null
Ensure that headers are utf8, not unicode

Although the api.openstack.wsgi.ResponseObject converted the headers to
utf8 strings to comply with RFC for HTTP this was not enough, since some
responses that contained unicode strings were returned, causing an error
when running nova behind an http server like Apache. This change ensures
that headers are always an utf8 encoded string.

Closes-Bug: 1254017

Change-Id: I980326f1f15907bf57060acdd132011254289079