### Description
Same exact configuration that works with kamailio5.1+rtpengine7 does NOT work on 5.2
#### Reproduction
I'm using https://github.com/davidcsi/kamailio-private-public/blob/master/README.md and i used kamailio's 5.0, 5.1 from the kamailio's debian repo. Both start properly.
When i switched to 5.2 it won't start, complaining it's running out of memory, but no matter how much memory I'd add, it just won't start.
#### Log Messages
kamailio's log https://github.com/davidcsi/kamailio-private-public/blob/master/kamailio52-r...
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
``` root@ip-10-0-210-226:~# kamailio -v version: kamailio 5.2.2 (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 with gcc 6.3.0
```
* **Operating System**:
Debian stretch 9
``` root@ip-10-0-210-226:~# uname -a Linux ip-10-0-210-226 4.9.0-8-amd64 #1 SMP Debian 4.9.130-2 (2018-10-27) x86_64 GNU/Linux ```