http.lua: set transfer-encoding if source and no content-length

If a source is specified without a content-length header, LuaSocket
sends the data in the chunked transfer coding; however, it doesn't set
the transfer-encoding header.  While I recognize that the user can set
this manually, this is a gotcha that has caught me multiple times.

RFC7230, section 3.3.3
  (https://tools.ietf.org/html/rfc7230#section-3.3.3)
is clear about this; if neither content-length nor transfer-encoding
chunked are specified, the request message body length is zero.  While
some servers may ignore this, I have encountered several that follow
the RFC in this regard, most recently golang's net/http.

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