Allow more than one challenge - multiple authenticate response-header [rfc2616 sec14.47]

[Sergey Brester]

Hi, 

enclosed you will find an attached changeset, that allows more than one
authentication challenge - multiple authenticate response-header
[rfc2616 sec14.47].

Implemented for auth_request and http upstream (ex. backends).

If you want to support it in your own authentication module, just call
`ngx_http_upstream_transmit_headers` after setting
`headers_out.www_authenticate` of request, like in both implemented
modules (see changeset attached).
For upstreams simply add a multiple header entries with
www-authentificate challenges, supported from your module.

PS. If someone needs a git version of it:
https://github.com/sebres/nginx/commits/hg-sb-mod [1] 

Regards, 

sebres. 

Links:
------
[1] https://github.com/sebres/nginx/commits/hg-sb-mod
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