In one config I use
```
dns_cache_flags = 4
dns_cache_init = off
```
Looks as when Kamailio try to resolve DNS hostname sended two DNS requests:
1. A for IPv4 address resolving;
2. AAAA for IPv6 address resolving.
When DNS hostname has only AAAA record and do not has A record, then
1. AAAA request will be successful;
2. A request will return `NXDomain`.
Looks as when Kamailio received `NXDomain`, then takes the server hostname
domain and adds this part to searched DNS name and repeated request.
Example:
1. I need to send a packet to `ipv6.test-ipv6.com` that has only AAAA dns
record.
2. Kamailio hostname `proxy.example.com`;
3. Kamailio send `ipv6.test-ipv6.com` AAAA request, successful;
4. Kamailio send `ipv6.test-ipv6.com` A request, `NXDomain`;
3. Kamailio send `ipv6.test-ipv6.com.example.com` AAAA request, `NXDomain`;
4. Kamailio send `ipv6.test-ipv6.com.example.com` A request, `NXDomain`.
Using absolute DNS name, I want Kamailio to not modify DNS name and not send
extra requests.
Tested on master.
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