reorder middleware in chef::http::simple

the api here reverses the order of the reversed order in the
responses for some reason.  this broke remote_file for most of the
internet.
fix spec test

compared to the same test in rest_spec.rb this makes no sense at all
why we need to invert it, and its clear to me why this bug got through code
review because it looks obviously correct.  it looks very obviously
wrong now, but it works.