### Description
I have 2 mtrees defined that get loaded on startup. I have not specified the
`db_table` value but have changed each of the values for `tname_column`,
`tprefix_column`, and `tvalue_column`.
`kamcmd mtree.summary` and `kamcmd mtree.list` show that the data was
successfully loaded. I expected that running `kamcmd mtree.reload` would reload
these mtrees from the database. Running this or sending the same command as an
http xmlrpc request yields "error: 500 - Mtree Reload Failed". The same error
is received if I try to reload a specific mtree. Prior to this version we were
successfully reloading these mtrees with MI commands.
### Troubleshooting
#### Reproduction
Use the following mtree paramters with a database table that has the name,
prefix, and value fields.
```
modparam("mtree", "tname_column", "name")
modparam("mtree", "tprefix_column", "prefix")
modparam("mtree", "tvalue_column", "value")
modparam("mtree", "mtree", "name=some_mtree;dbtable=some_table;type=0;multi=0")
```
Verify the mtrees were successfully created and attempt to reload with the
mtree.reload RPC command.
We are not using an mtrees table and this throws an error that the table does
not exist (see logs below). Try creating the mtrees table according to the
script located at utils/kamctl/mysql/mtree-create.sql and insert the tname,
tprefix, and tvalue values used above. The same error is thrown with a
different log entry.
#### Log Messages
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Without mtrees table:
```
Apr 4 21:45:51 localhost /usr/local/sbin/kamailio[26416]: ERROR: db_mysql
[km_dbase.c:128]: db_mysql_submit_query(): driver error on query: Table
'db_name.mtrees' doesn't exist (1146)
Apr 4 21:45:51 localhost /usr/local/sbin/kamailio[26416]: ERROR: <core>
[db_query.c:132]: db_do_query_internal(): error while submitting query
Apr 4 21:45:51 localhost /usr/local/sbin/kamailio[26416]: ERROR: mtree
[mtree_mod.c:724]: mt_load_db_trees(): Error while querying db
Apr 4 21:45:51 localhost /usr/local/sbin/kamailio[26416]: ERROR: mtree
[mtree_mod.c:928]: rpc_mtree_reload(): cannot re-load mtrees from database
```
With mtrees table:
```
Apr 4 21:41:47 localhost /usr/local/sbin/kamailio[26416]: ERROR: db_mysql
[km_dbase.c:128]: db_mysql_submit_query(): driver error on query: Unknown
column 'name' in 'field list' (1054)
Apr 4 21:41:47 localhost /usr/local/sbin/kamailio[26416]: ERROR: <core>
[db_query.c:132]: db_do_query_internal(): error while submitting query
Apr 4 21:41:47 localhost /usr/local/sbin/kamailio[26416]: ERROR: mtree
[mtree_mod.c:724]: mt_load_db_trees(): Error while querying db
Apr 4 21:41:47 localhost /usr/local/sbin/kamailio[26416]: ERROR: mtree
[mtree_mod.c:928]: rpc_mtree_reload(): cannot re-load mtrees from database
```
### Additional Information
According to the documentation found here:
http://kamailio.org/docs/modules/5.0.x/modules/mtree.html the db_table param
should be ignored if a mtree paramter is defined so I would not expect to need
the mtrees table. The data is successfully loaded at startup so I believe the
issue is just with the reload command. Our kamailio config and database schema
has not changed and we were able to reload mtrees successfully with MI commands
in previous releases.
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.0.0 (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 14:35:44 Apr 4 2017 with gcc 4.8.5
```
* **Operating System**:
```
Linux proxy.vagrant.vm 3.10.0-514.6.2.el7.x86_64 #1 SMP Thu Feb 23 03:04:39 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux
CentOS Linux release 7.3.1611 (Core)
```
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