[sr-dev] [kamailio/kamailio] [5.2.3][app_python3][KEMI] KSR.registrar.save fails with "domain not found" (#1972)

[Michael Seifert]

### Description
When using the Python3 extension for KEMI, `registrar.save` complains about an unknown location: `registrar [api.c:44]: regapi_save(): usrloc domain [location] not found`. Saving the user location works without problems in the core scripting language.

### Troubleshooting

#### Reproduction

Here is a fairly minimal Python3 script:
```python
import KSR as KSR

def mod_init():
    KSR.info("===== from Python mod init\n")
    return kamailio()

class kamailio:
    def __init__(self):
        KSR.info('===== kamailio.__init__\n')

    def child_init(self, rank):
        KSR.info('===== kamailio.child_init(%d)\n' % rank)
        return 0

    def ksr_request_route(self, msg):
        KSR.hdr.remove('Route')
        if KSR.is_method('INVITE'):
            KSR.rr.record_route()

        if not KSR.is_myself_ruri():
            KSR.info(f'Relaying to foreign domain: to={msg.RURI} method={msg.Method}\n')
            return self.relay(msg)

        if KSR.is_method("REGISTER"):
            return self.registration(msg)
        KSR.registrar.lookup("location")
        KSR.sl.send_reply(100, "Trying")
        return self.relay(msg)

    def ksr_reply_route(self, msg):
        KSR.info(f'Received response: from={msg.src_address} status={msg.Status}\n')
        return 1

    def ksr_onsend_route(self, msg):
        if msg.Type == 'SIP_REQUEST':
            KSR.info(f'Sending request: to={msg.dst_address} method={msg.Method}\n')
        return 1

    def registration(self, msg):
        if not KSR.registrar.save("location", 0x01):
            KSR.sl.sl_reply_error()
        return 1

    def relay(self, msg):
        if not KSR.tm.t_relay():
            KSR.sl.sl_reply_error()
        return 1
```

If this script is used for request routing, the user locations cannot be saved and the above mentioned error is logged.

#### Log Messages
`4(4360) ERROR: {1 15678 REGISTER 16c11b02-2458-4263-9350-c2f26fafee53} registrar [api.c:44]: regapi_save(): usrloc domain [location] not found`

### Additional Information

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

```
version: kamailio 5.2.3 (x86_64/linux) c36229
flags: STATS: Off, USE_TCP, USE_TLS, TLS_HOOKS, USE_RAW_SOCKS, 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_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: c36229 
compiled on 13:25:11 Jun  2 2019 with gcc 8.3.0
```

* **Operating System**:

```
Linux linux 5.1.5-gentoo #1 SMP PREEMPT Mon May 27 14:42:14 CEST 2019 x86_64 AMD A6-3670 APU with Radeon(tm) HD Graphics AuthenticAMD GNU/Linux
```


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