support for proxy_http_version automatically detect

[Chuanwen Chen]

In our case, we needed to set proxy_http_version to 1.0 or 1.1 according to
client, because the clients for http 1.0 could not proceed chunked encoding
gzip through keep-alive connections correctly, but 'proxy_http_version'
didn't help.

Finally we had this patch, and a simple test case for it, and I checked it
under nginx-1.9.7.

Wish it helps.
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