[sr-dev] [kamailio/kamailio] db_mongodb has a problem with projection (#1479)

[kelchy]

### Description

on upgrade to 5.1.2, db_mongodb broke

### Troubleshooting
i create a [PR](https://github.com/kamailio/kamailio/pull/1477) to print out any mongo query error

then i saw the debug messages below

#### Reproduction

install 5.1.2, use mongo as db for sip_trace module

#### Debugging Data

```
DEBUG: db_mongodb [mongodb_connection.c:55]: db_mongodb_new_connection(): connection open to: mongodb://user:pass@mongo1.abc.com:17017/collection
DEBUG: db_mongodb [mongodb_dbase.c:904]: db_mongodb_query(): query to collection [version]
DEBUG: db_mongodb [mongodb_dbase.c:938]: db_mongodb_query(): query filter: { "table_name" : "sip_trace" }
DEBUG: db_mongodb [mongodb_dbase.c:966]: db_mongodb_query(): columns filter: { "projection" : { "table_version" : 1 } }
DEBUG: db_mongodb [mongodb_dbase.c:782]: db_mongodb_store_result(): An error occurred: Unsupported projection option: projection: { table_version: 1 }
ERROR: <core> [db.c:450]: db_check_table_version(): invalid version 0 for table sip_trace found, expected 4 (check table structure and table "version")
ERROR: siptrace [siptrace.c:435]: child_init(): error during table version check
ERROR: <core> [core/sr_module.c:942]: init_mod_child(): error while initializing module siptrace (/usr/lib64/kamailio/modules/siptrace.so) (idx: 39 rank: -2 desc: [Http Async Worker])
```

#### Log Messages


#### SIP Traffic


### Possible Solutions

change the way mongo builds the query

### Additional Information

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

```
version: kamailio 5.1.2 (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 06:43:15 Mar  9 2018 with gcc 4.8.2

```

* **Operating System**:

<!--

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```
Ubuntu 14.04.1 LTS \n \l

Linux hostname 3.13.0-53-generic #89-Ubuntu SMP Wed May 20 10:34:39 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

```


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https://github.com/kamailio/kamailio/issues/1479
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