[sr-dev] [kamailio/kamailio] extensions to lost and http_client modules (#2675)

[Wolfgang Kampichler]

> tested config
> 
> ```
> listen=udp:127.0.0.1:5060
> loadmodule "xlog.so"
> loadmodule "pv.so"
> loadmodule "http_client.so"
> loadmodule "lost.so"
> loadmodule "textopsx.so"
> 
> modparam("lost", "exact_type", 1)
> modparam("lost", "post_request", 1)
> modparam("http_client", "httpcon", "lostsrv=>http://api.example.com/api/lost");
> 
> 
> request_route {
>   $var(res) = lost_query("lostsrv", "$var(uri)", "$var(name)", "$var(err)");
>   xlog("L_INFO", "LOST findService: Result code $var(res)\nUri: $var(uri)\nName: $var(name)\n");
> }
> ```
> 
> Test with one `Geolocation` header.
> LOST request send with HTTP headers like
> 
> ```
> POST /api/lost HTTP/1.1
> Host: api.example.com
> User-Agent: kamailio (5.5.0-pre0 (x86_64/linux))
> Accept: */*
> Content-Type: application/lost+xml;charset=utf-8
> Content-Length: 526
> ```
> 
> Here may be updated
> 
> ```
> Accept: application/lost+xml
> ```

@sergey-safarov: that looks like another http_client API fix as the API call does not support to set a specific header.

> 
> Also in Kamailio console, I can see this error message when `Geolocation` passed as a value
> 
> ```
>  1(82) ERROR: <core> [core/parser/parse_body.c:510]: part_multipart_headers_cmp(): error code: "-9" error text: "We reached the end of the buffer".
> ```
> 
> Looks as here here "ERROR" level misslead.
> My test SIPp script attached.
> 
> [test_call.xml.gz](https://github.com/kamailio/kamailio/files/6255191/test_call.xml.gz)
> 
> The script may be started using the command
> 
> ```
> sipp -m 1 -sf test_call.xml -p 2345 127.0.0.1
> ```

@sergey-safarov: I see the same ERROR, but I suspect it is more of a WARNING

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