add limit_upstream to nginx

[Chuanwen Chen]

I wrote a module for nginx 4 years ago which limited the number of
connections to upstream in order that the upstream servers would not be too
busy to work efficiently. Now I think this module is stable, and expect it
to be merged into nginx official if possible.

the code is here:
*https://github.com/cfsego/nginx-limit-upstream
<https://github.com/cfsego/nginx-limit-upstream>*

sincerely
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