### Description
When configured `read_sdp_pv` param for rtpengine module, then multipart
content dropped in the body.
And the message cannot be parsed because
```
Content-Type: multipart/mixed;boundary=level3-boundary
```
But the message body does not have a separator.
### Troubleshooting
#### Reproduction
To reproduce need to start Kamailio with config file
```
loadmodule "pv.so"
loadmodule "ctl.so"
loadmodule "corex.so"
loadmodule "sdpops.so"
loadmodule "rtpengine.so"
modparam("rtpengine", "rtpengine_sock", "udp:localhost:2223")
modparam("rtpengine", "read_sdp_pv", "$var(sdp_for_rtpengine)")
listen=udp:x.x.x.x:5060
request_route {
$var(sdp_for_rtpengine) = $sdp(body);
rtpengine_manage("ICE=force");
forward();
}
```
And then send call using `sipp` script
```xml
<scenario name="Basic Sipstone UAC">
<!-- In client mode (sipp placing calls), the Call-ID MUST be -->
<!-- generated by sipp. To do so, use [call_id] keyword. -->
<send retrans="500">
<![CDATA[
INVITE sip:[service]@example.com:[remote_port] SIP/2.0
Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
From: sipp <sip:sipp@[local_ip]:[local_port]>;tag=[call_number]
To: sut <sip:[service]@[remote_ip]:[remote_port]>
Call-ID: [call_id]
CSeq: 1 INVITE
Contact: sip:sipp@[local_ip]:[local_port]
Max-Forwards: 70
Subject: Performance Test
Content-Type: multipart/mixed;boundary=level3-boundary
Content-Length: [len]
--level3-boundary
Content-Type: application/sdp
v=0
o=user1 53655765 2353687637 IN IP[local_ip_type] [local_ip]
s=-
c=IN IP[media_ip_type] [media_ip]
t=0 0
m=audio [media_port] RTP/AVP 0
a=rtpmap:0 PCMU/8000
--level3-boundary
Content-Type: application/isup;version=ansi
Content-Disposition: session;handling=optional
\x01\x18\x08\x10\x0a\x03\x06\x0d\x03\x80\x90\xa2\x07\x03\x10\x87\x36\x08\x14\x89
\x0a\x07\x03\x13\x27\x97\x45\x28\x49\xc0\x08\xc0\x03\x10\x65\x41\x17\x88\x67\x3d
\x01\x11\xc4\x03\x01\x01\x00\xea\x01\x01\xc7\x01\x20\x01\x0d\x0a
--level3-boundary--
]]>
</send>
```
If the `read_sdp_pv` param will be commented in the Kamailio config file, then
the resulting message will be properly formatted and have the other multipart
media.
--
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https://github.com/kamailio/kamailio/issues/3854
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