cmogstored 1.7.3

Improve RFC 7230 conformance w.r.t Content-Length and
Transfer-Encoding handling in PUT requests.  We now
favor "Transfer-Encoding: chunked" if a Content-Length
header is also present.  Furthermore, we no longer
accept Transfer-Encoding values aside from chunk,
since we don't support gzip/compress/deflate as described
in RFC 7230.