[sr-dev] [kamailio/kamailio] core: dns slow queries reporting (#1824)

[Julien Chavanton]

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#### Type Of Change
- [ ] Small bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
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- [ ] PR should be backported to stable branches
- [x] Tested changes locally
- [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description

I remember there was some discussion about adding DNS statistics, I think I remember a discussion involving @ngvoice Carsten ?

This is adding a parameter to the core `dns_slow_query_ms`

Example:
```
dns_slow_query_ms=100
```

When using the internal resolver any query taking more than `dns_slow_query_ms` will be lodged as a warning :
```
dns_slow_query_ms=10 (example with 10ms)

 5(5960) WARNING: <core> [core/resolve.c:752]: get_record(): res_search[35][us-west-wa.sip.flowroute.com]elapsed[12ms]
 5(5960) WARNING: <core> [core/resolve.c:752]: get_record(): res_search[1][ep-us-west-wa-01.flowroute.com]elapsed[12ms]
```

and a statistic counter will be incremented :
```
kamcmd stats.fetch dns:slow_dns_request
{
    dns.slow_dns_request: 1
}
```

I think this will be a good start to monitor the impact of slow DNS queries on Kamailio.


You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/1824

-- Commit Summary --

  * core: dns slow queries reporting

-- File Changes --

    M src/core/cfg.lex (3)
    M src/core/cfg.y (3)
    M src/core/cfg_core.c (3)
    M src/core/cfg_core.h (1)
    M src/core/resolve.c (17)
    M src/core/resolve.h (3)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1824.patch
https://github.com/kamailio/kamailio/pull/1824.diff

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