[sr-dev] [kamailio/kamailio] absolute dns names trigger error (#2706)

[sergey-safarov]

### Description
To avoid extra DNS requests I want to use absolute DNS names instead of relative.
To do this I configured
```
modparam("siptrace", "duplicate_uri", "sip:sip-trace6.example.com.:9060"
```
And now I can see errors
```
CRITICAL: <core> [core/proxy.c:264]: mk_proxy(): could not resolve hostname: "sip-trace6.example.com."
ERROR: siptrace [siptrace_hep.c:178]: trace_send_hep3_duplicate(): bad host name in uri
CRITICAL: <core> [core/proxy.c:264]: mk_proxy(): could not resolve hostname: "sip-trace6.example.com."
ERROR: siptrace [siptrace_hep.c:178]: trace_send_hep3_duplicate(): bad host name in uri
CRITICAL: <core> [core/proxy.c:264]: mk_proxy(): could not resolve hostname: "sip-trace6.example.com."
ERROR: siptrace [siptrace_hep.c:178]: trace_send_hep3_duplicate(): bad host name in uri
```
I am expecting "sip-trace6.example.com." DNS name resolution without errors in Kamailio log.

used current master.

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