[sr-dev] [kamailio/kamailio] app_lua: htable event_callback failed (#1519)

[Surendra Tiwari]

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### Description
event_callback for app_lua is not working 

### Troubleshooting

#### Reproduction
# ----- app_lua params ----
1. load the htable and app_lua with following parameters
modparam("app_lua", "reload", 1)
modparam("app_lua", "load", "/usr/local/etc/kamailio/route.lua")
modparam("htable", "event_callback", "ksr_htable_event")

-- event callback function implemented in Lua
function ksr_htable_event(evname)
        KSR.info("===== htable module triggered event: " .. evname .. "\n");
        return 1;
end


#### Debugging Data
May  3 12:15:19 ip-172-31-4-160 kamailio[9797]: ERROR: app_lua [app_lua_api.c:652]: app_lua_run_ex(): lua loading state not initialized (call: ksr_htable_event)


```
(paste your debugging data here)
```

#### Log Messages

```
May  3 12:15:19 ip-172-31-4-160 kamailio[9797]: ERROR: app_lua [app_lua_api.c:652]: app_lua_run_ex(): lua loading state not initialized (call: ksr_htable_event)
```

#### SIP Traffic

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### 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.
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### Additional Information

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

```
root at ip-172-31-4-160:/usr/local/etc/kamailio# kamailio -v
version: kamailio 5.1.3 (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 15:16:50 Apr 24 2018 with gcc 4.8.4
```

* **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`)
-->

```
root at ip-172-31-4-160:/usr/local/etc/kamailio# uname -a
Linux ip-172-31-4-160 3.13.0-143-generic #192-Ubuntu SMP Tue Feb 27 10:45:36 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
```


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