[sr-dev] [kamailio/kamailio] rtpproxy: jammed two IP in SDP o line (#1042)

[Rick]

### Description

manage_rtpproxy creates wrong SDP with jammed IPs in o line

### Troubleshooting

#### Reproduction

```
    if (nat_uac_test("8"))
    {
        rtpproxy_manage("fco");
    }
    else
    {
        rtpproxy_manage("fcor");
    }
```

#### SIP Traffic

SDP bevor manage_rtpproxy 
```
v=0
o=- 584 1 IN IP4 x.x.x.114
s=-
t=0 0
m=audio 35872 RTP/AVP 8 101 13
c=IN IP4 x.x.x.114
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=rtpmap:13 CN/8000
a=fmtp:101 0-15
a=ptime:20
a=silenceSupp:off - - - -
a=sendrecv
```

SDP after manage_rtpproxy()
```
v=0
o=- 811475204 1682787633 IN IP4 x.x.x.116x.x.x.114
s=-
c=IN IP4 x.x.x.114
t=0 0
m=audio 37872 RTP/AVP 8 101
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
a=direction:both
```

### Additional Information

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

```
version: kamailio 5.0.0-pre0 (x86_64/freebsd) 
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, 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, select, kqueue.
id: unknown 
compiled on 10:24:52 Jan 27 2017 with clang 3.8
```

* **Operating System**:

```
uname -a
FreeBSD xxxx 11.0-RELEASE-p2 FreeBSD 11.0-RELEASE-p2 #0: Mon Oct 24 06:55:27 UTC 2016     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

freebsd-version -ku
11.0-RELEASE-p2
11.0-RELEASE-p7
```


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https://github.com/kamailio/kamailio/issues/1042
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