[sr-dev] [kamailio/kamailio] presence_xml db_url param can not set (#1809)

[Cui Gang]

### Description
I'm testing the presence feature, on branch 5.2 last version 1e56e4d .
modparam("presence_xml", "db_url", DBURL)
Can not set db_url of the presence_xml correct value. presence_xml db_url always the default value(DEFAULT_DB_URL). The same way, presence db_url is right.

#### Debugging Data
presence.cfg file:
```
debug=3
#!define DBURL "mysql://kamailio:kamailiorw@localhost/kamailio52"

/* set paths to location of modules */
mpath="/usr/local/kamailio/lib64/kamailio/modules/"

loadmodule "db_mysql.so"
loadmodule "tm.so"
loadmodule "sl.so"

loadmodule "presence.so"
loadmodule "presence_xml.so"

modparam("presence", "db_url", DBURL)

modparam("presence_xml", "db_url", DBURL)
modparam("presence_xml", "integrated_xcap_server", 1)

request_route {
	exit;
}
```

#### Log Messages

```
0(76822) DEBUG: <core> [core/sr_module.c:896]: init_mod(): presence
 0(76822) DEBUG: presence [presence.c:282]: mod_init(): db_url=mysql://kamailio:kamailiorw@localhost/kamailio52/48/0x102b9e860
....
0(76822) DEBUG: <core> [core/sr_module.c:896]: init_mod(): presence_xml
 0(76822) DEBUG: presence_xml [presence_xml.c:159]: mod_init(): db_url=mysql://kamailio:kamailiorw@localhost/kamailio/46/0x103cf2d64
...
 0(76822) DEBUG: presence_xml [add_events.c:139]: xml_add_events(): added 'xcap-diff' event to presence module
 0(76822) DEBUG: <core> [core/sr_module.c:619]: find_mod_export_record(): found export of <db_bind_api> in module db_mysql [/usr/local/kamailio/lib64/kamailio/modules/db_mysql.so]
 0(76822) DEBUG: <core> [db.c:210]: db_bind_mod(): using db bind api for db_mysql
 0(76822) DEBUG: <core> [db.c:315]: db_do_init2(): connection 0x102bac2e8 not found in pool
 0(76822) DEBUG: db_mysql [km_my_con.c:108]: db_mysql_new_connection(): opening connection: mysql://xxxx:xxxx@localhost/kamailio
 0(76822) ERROR: db_mysql [km_my_con.c:139]: db_mysql_new_connection(): driver error: Unknown database 'kamailio'
 0(76822) ERROR: <core> [db.c:319]: db_do_init2(): could not add connection to the pool 0(76822) ERROR: presence_xml [presence_xml.c:214]: mod_init(): while connecting to database
 0(76822) ERROR: <core> [core/sr_module.c:899]: init_mod(): Error while initializing module presence_xml (/usr/local/kamailio/lib64/kamailio/modules/presence_xml.so)
ERROR: error while initializing modules

```

The correct db_url is #!define DBURL "mysql://kamailio:kamailiorw@localhost/kamailio52"
I don't know why presence_xml db_url always the default value in the source code DEFAULT_DB_URL.

### Additional Information

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

```
version: kamailio 5.2.0 (x86_64/darwin) 1e56e4
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_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, select, kqueue.
id: 1e56e4
compiled on 23:15:49 Jan 12 2019 with gcc Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/c++/4.2.1 Apple LLVM version 10.0.0 (clang-1000.11.45.5) Target: x86_64-apple-darwin18.2.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
```

* **Operating System**:

```
MacOS
```


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