[sr-dev] [kamailio/kamailio] carrierroute: cr.dump_routes prints error or hangs after over 100 prefixes (#1304)

[Rick]

### Description
Try to fill carrierroute with routing data and test result with `kamcmd`, but the rpc command never gives a result.

### Troubleshooting

#### Reproduction

```
/* ----- ctl params -------------------------------------------------------- */
modparam("ctl", "binrpc", "unix:/var/run/kamailio/kamailio_ctl")
modparam("ctl", "mode", 0660)

/* ----- carrierroute params ----------------------------------------------- */
modparam("carrierroute", "config_source", "db")
modparam("carrierroute", "db_url", "EXTERN_READ_DBURL")
modparam("carrierroute", "fetch_rows", 2000)
modparam("carrierroute", "db_load_description", 1)
modparam("carrierroute", "match_mode", 10)
modparam("carrierroute", "avoid_failed_destinations", 1)
```

Kamailio is running with the following parameters:
```
/usr/local/sbin/kamailio -u kamailio -g kamailio -m 512 -M 20 -n 16
```

Fill carrierroute table with 110 Routes, do a routes reload and than try to get the routes dumped.

`kamcmd cr.reload_routes` and after that issue `kamcmd cr.dump_routes`, which hangs and don't return a result.


#### Log Messages

```
nothing regarding carrierroute in the log
```


### Possible Solutions

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If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix.
-->

### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
version: kamailio 5.1.0-dev8 (x86_64/freebsd) 
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, 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_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, select, kqueue.
id: unknown 
compiled on 20:35:54 Nov  1 2017 with clang 4.0
```

* **Operating System**:

<!--
Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `uname -a`)
-->

```
FreeBSD 11.1-RELEASE
```


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https://github.com/kamailio/kamailio/issues/1304
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