* common/http.c (send_request, connect_server, http_open): Use a
struct srv instead of a single srvtag so we can pass the chosen host
and port back to the caller.
(connect_server): Use the proper port in the HAVE_GETADDRINFO case.
* keyserver/curl-shim.c (curl_easy_perform): Use struct srv and log
chosen host and port.
* keyserver/gpgkeys_hkp.c (main): Properly take the port given by SRV.
Backported from ba9e974f1fd85b3dbbfb5e26d7a14f71d07c7cf2
a CURLOPT_SRVTAG_GPG_HACK (passed through the the http engine).
* http.h: Allow passing srvtag to http_open and http_open_document.
* http.c (http_open, http_open_document): Allow passing srvtag to
http_open and http_open_document.
