Use HTTPFound if HTTPSeeOther doesn't exist in swob

This is a temporary fix to run unit tests. HTTPSeeOther has been
added to swift codebase but is not present in swift 1.9.1

Change-Id: I38207a76c38aa091e790ad0b5e1253505fbc8fb8
Signed-off-by: Prashanth Pai <ppai@redhat.com>
Reviewed-on: http://review.gluster.org/6051
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>