[sr-dev] [kamailio/kamailio] Kamailio stops responding to SIP requests when it cannot resolve DNS from siptrace (#2081)

[ramontelnyx]

<!--

### Description

<!--
Kamailio goes unresponsive when it cannot resolve a DNS from siptrace
We are using siptrace to integrate Kamailio with Homer and we have a DNS on the duplicate_uri field. We noticed that when Kamailio cannot resolve this domain it freezes and stops responding to SIP requests.
-->

#### Reproduction
```
You can reproduce the issue by:
1) Enabling siptrace
2) Populating the duplicate_uri field with a non-existing domain
3) Sending test calls
```
#### Log Messages
```
1(1164) CRITICAL: <core> [core/proxy.c:264]: mk_proxy(): could not resolve hostname: "homer7-hep.query.consul"
1(1164) ERROR: siptrace [siptrace_hep.c:177]: trace_send_hep3_duplicate(): bad host name in uri
```

### Additional Information
```
# /usr/local/sbin/kamailio -version
version: kamailio 5.2.4 (x86_64/linux) a57138
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: a57138 
compiled on 14:41:20 Aug 21 2019 with gcc 6.3.0
```

* **Operating System**:
```
LInux Debian Stretch
Linux 4.4.0-109-generic #132-Ubuntu SMP Tue Jan 9 19:52:39 UTC 2018 x86_64 GNU/Linux
```


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https://github.com/kamailio/kamailio/issues/2081
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