[sr-dev] [kamailio/kamailio] Incorrect routing of RPACK packets with topos module (#1167)

[Sergey Lavrov]

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### Description

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Explain what you did, what you expected to happen, and what actually happened.
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Kamailio incorrectly routed RPACK packets with topos module enabled. In the same time there is no problem with topoh module enabled.
It's seems like related to #1097,

### Troubleshooting

#### SIP Traffic

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RPACK SIP packets with Kamailio topos module: http://imgur.com/SScErQp
RPACK SIP packets with Kamailio topoh module: http://imgur.com/45ch3HB

### Possible Solutions

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### Additional Information

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

```
version: kamailio 5.1.0-dev4 (x86_64/linux) (git revision 7dbf3fe)
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, 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_LISTEN 16, 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 00:24:21 Jun 26 2017 with gcc 4.8.5
```

* **Operating System**:

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Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `uname -a`)
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```
Red Hat Enterprise Linux Server release 7.3 (Maipo)
Linux 2.6.32-042stab113.21 #1 SMP Wed Mar 23 11:05:25 MSK 2016 x86_64 x86_64 x86_64 GNU/Linux
```


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