[PATCH] Add support for uwsgi host and port variables

[Derrick Petzold]

Hello,

I added support for setting the following variables:

uwsgi_host - The host and port of the uwsgi server that handled the request.
uwsgi_port - The port of the uwsgi server that handled the request.

They are modeled after the proxy_host and proxy_port variables. (I
shamelessly copied that code). The major change is that the uwsgi
module now has its own context structure whereas before it was using
ngx_http_status_t. Please let me know if you have any questions or
comments.

Regards,
  Derrick
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