[sr-dev] [kamailio/kamailio] siptrace: frong IPv4 address value (#2092)

[sergey-safarov]

### Description

Please check attached pcap.
[siptrace.pcap.gz](https://github.com/kamailio/kamailio/files/3688791/siptrace.pcap.gz)

Kamailio send INVITE (packet 1) from port `TCP/42394`.
SIP trace encapsulate INVITE (packet 2) and encodes Kamailio source port `TCP/5060`

#### Debugging Data
HEP header parsed by lua [disector](https://github.com/sipcapture/hep-wireshark)
```
HEP3 Protocol
    HEP ID: HEP3
    Length (Bytes): 1574
    Protocol family: IPv4
    Protocol ID: TCP
    Source IPv4 address: 172.21.0.131
    Destination IPv4 address: 192.168.57.11
    Source port: 5060
    Destination port: 5060
    Timestamp: 1570150645
    Timestamp us: 740165
    Protocol Type: SIP
    Capture ID: 1
    Payload [truncated]: INVITE sip:911 at 192.168.57.11;transport=tcp SIP/2.0\r\nRecord-Route: <sip:172.21.0.131;transport=tcp;lr=on;ftag=KvNj7jXrmK89p>\r\nVia: SIP/2.0/TCP 172.21.0.131;branch=z9hG4bK7c2d.2d8104273b7063309f5694ac963c9ad8.0;i=21
```
[HEP format description located here](https://github.com/sipcapture/HEP/blob/master/docs/HEP3_Network_Protocol_Specification_REV_30.pdf).

### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
/ # kamailio -v
version: kamailio 5.1.6 (x86_64/linux) 
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144 MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown 
compiled on 11:01:40 Oct  4 2018 with gcc 6.4.0
```

* **Operating System**:
Docker container
Userland
```
/ # cat /etc/os-release 
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.8.1
PRETTY_NAME="Alpine Linux v3.8"
HOME_URL="http://alpinelinux.org"
BUG_REPORT_URL="http://bugs.alpinelinux.org"
```
Kernel Amazon Linux 2
```
/ # uname -a
Linux proxy-dc0-0 4.14.128-112.105.amzn2.x86_64 #1 SMP Wed Jun 19 16:53:40 UTC 2019 x86_64 Linux
```


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