Glance returns dual version strings in 'Location' header when redirecting a '/v#' request

Fix proposed to branch: master
Review: https://review.openstack.org/28217

Reviewed: https://review.openstack.org/28217
Committed: http://github.com/openstack/glance/commit/abbc5353336001572290feb8d06d65094b83a7cf
Submitter: Jenkins
Branch: master

commit abbc5353336001572290feb8d06d65094b83a7cf
Author: James Li <email address hidden>
Date: Fri May 3 22:31:58 2013 +0000

    Redirects requests from /v# to /v#/ with correct Location header

    This is a continuous fix to bug #1166957

    VersionNegotiationFilter pops off the version string of PATH_INFO,
    the popped segment is pushed onto SCRIPT_NAME, which results in
    dual version strings (e.g. '/v1/v1/') in the 'Location' header
    of a redirect response. This may result in a further 404 error
    if the http client will automatically follow the returned
    redirect.

    Fix this problem by adding a private method which does not
    push the popped segment onto SCRIPT_NAME.

    Change-Id: Ie0c244af38534dde2058828fbff840a845cc7c90
    Fixes: bug #1175815