### 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@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64

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