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### Description

when using db_text, can't use relative path, only full path is working in kamailio 4.4

modparam("lcr", "db_url", "text://dbtext") -- do not work

modparam("lcr", "db_url", "text:///usr/local/etc/kamailio/dbtext") -- works as expected

### Troubleshooting

#### Reproduction

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#### Debugging Data

<!-- If you got a core dump, use gdb to extract troubleshooting data - full backtrace, local variables and the list of the code at the issue location.

gdb /path/to/kamailio /path/to/corefile bt full info locals list

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

#### Log Messages

<!-- Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` 0(1) DEBUG: db_text [dbt_file.c:104]: dbt_load_file(): db is [/usr/local/etc/kamailio/] 0(1) DEBUG: db_text [dbt_file.c:119]: dbt_load_file(): loading file [/usr/local/etc/kamailio/] 0(1) DEBUG: db_text [dbt_tb.c:181]: dbt_table_new(): mtime is 1504165928 0(1) ERROR: db_text [dbt_base.c:215]: dbt_query(): table version not loaded! (too few columns) 0(1) ERROR: db_text [dbt_base.c:357]: dbt_query(): failed to query the table! 0(1) ERROR: <core> [db.c:397]: db_table_version(): error in db_query 0(1) ERROR: <core> [db.c:436]: db_check_table_version(): querying version for table lcr_rule 0(1) ERROR: lcr [lcr_mod.c:649]: mod_init(): error during table version check 0(1) ERROR: <core> [sr_module.c:967]: init_mod(): Error while initializing module lcr (/usr/local/lib64/kamailio/modules/lcr.so)

```

#### SIP Traffic

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``` (paste your sip traffic here) ```

### Possible Solutions

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use full path

### Additional Information

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

``` version: kamailio 4.4.6 (x86_64/linux) 897942 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: 897942 compiled on 06:27:57 Aug 31 2017 with gcc 6.3.0

```

* **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`) -->

``` Debian GNU/Linux 9 \n \l

4.4.0-87-generic #110-Ubuntu SMP Tue Jul 18 12:55:35 UTC 2017 x86_64 GNU/Linux

```