[sr-dev] [kamailio/kamailio] Dispatcher ds_is_from_list (#1235)

[iliesh]

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### Description
"ds_is_from_list" function from Dispatcher module give false result - when actually it should be true.
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Explain what you did, what you expected to happen, and what actually happened.
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### Troubleshooting

#### Reproduction


modparam("dispatcher", "db_url",DBURL)
modparam("dispatcher", "table_name", "dispatcher")
modparam("dispatcher", "setid_col", "setid")
modparam("dispatcher", "destination_col", "destination")
modparam("dispatcher", "flags", 2)
modparam("dispatcher", "dst_avp", "$avp(AVP_DST)")
modparam("dispatcher", "grp_avp", "$avp(AVP_GRP)")
modparam("dispatcher", "cnt_avp", "$avp(AVP_CNT)")
modparam("dispatcher", "sock_avp", "$avp(AVP_SOCK)")

request_route {

xlog("L_INFO","[=Start Routing=]")

if(ds_is_from_list("1")) {
                xlog("L_INFO","[=FROM ASTERISK=]");
        } else {
                xlog("L_INFO","[=TO ASTERISK=]");
        }

if($si=="192.168.1.10") {
        xlog("L_INFO","[=FROM ASTERISK BY IP=]");
        } else {
        xlog("L_INFO","[=TO ASTERISK BY IP=]");
}

root at kamailio:/var/log# kamctl dispatcher show
dispatcher gateways
+----+-------+---------------------+-------+----------+-------+-----------------+
| id | setid | destination         | flags | priority | attrs | description     |
+----+-------+---------------------+-------+----------+-------+-----------------+
|  1 |     1 | sip:192.168.1.10:5060 |     0 |        3 |       | Main Asterisk   |
|  2 |     2 | sip:192.168.1.11:5060 |     0 |        2 |       | Backup Asterisk |
|  3 |     3 | sip:192.168.1.12:5060 |     0 |        1 |       | Test Asterisk   |
+----+-------+---------------------+-------+----------+-------+-----------------+
root at kamailio:/var/log#

cat /var/log/kamailio.log
[=Start Routing=]
**[=TO ASTERISK=]**
**[=FROM ASTERISK BY IP=]**

### Additional Information

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

```
root at kamailio:/var/log# kamailio -v
version: kamailio 5.0.3 (x86_64/linux)
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, 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_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled on 12:12:14 Sep  7 2017 with gcc 6.3.0
root at kamailio:/var/log#
```

* **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`)
-->

```
Debian 9.1/ Linux kamailio1 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u3 (2017-08-06) x86_64 GNU/Linux
```


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https://github.com/kamailio/kamailio/issues/1235
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