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### Description

<!-- Explain what you did, what you expected to happen, and what actually happened. --> After upgrading from 5.0 to 5.1.0, the use_domain parameter of the group module doesn't seem to work properly. The configuration file was not changed for the upgrade.

### Troubleshooting

#### Reproduction

Verified proper configuration ``` #!define WITH_GROUP

...

#!ifdef WITH_MULTIDOMAIN #!define MULTIDOMAIN 1 #!else #!define MULTIDOMAIN 0 #!endif

...

#!ifdef WITH_GROUP # ----- group params ----- modparam("group", "db_url", DBURL) modparam("group", "use_domain", MULTIDOMAIN) #!endif

```

#### 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). -->

The actual phone number has been replaced by `+1NXXNXXXXXX` below. ``` kamailio[5663]: DEBUG: <core> [core/select.c:412]: run_select(): Calling SELECT 0x7f072eecf700 kamailio[5663]: DEBUG: db_postgres [km_val.c:154]: db_postgres_val2str(): PQescapeStringConn: in: 12 chars, out: 12 chars kamailio[5663]: DEBUG: db_postgres [km_val.c:154]: db_postgres_val2str(): PQescapeStringConn: in: 3 chars, out: 3 chars kamailio[5663]: DEBUG: db_postgres [km_val.c:154]: db_postgres_val2str(): PQescapeStringConn: in: 0 chars, out: 0 chars kamailio[5663]: DEBUG: db_postgres [km_dbase.c:248]: db_postgres_submit_query(): sending query ok: 0x7f072efefca0 (2) - [select grp from grp where username='+1NXXNXXXXXX' AND grp='did' AND domain=''] kamailio[5663]: DEBUG: <core> [db_res.c:119]: db_new_result(): allocate 56 bytes for result set at 0x7f072efce170 kamailio[5663]: DEBUG: db_postgres [km_dbase.c:530]: db_postgres_store_result(): 0x7f072efefca0 PQresultStatus(PGRES_TUPLES_OK) PQgetResult(0x14f5d00) kamailio[5663]: DEBUG: db_postgres [km_res.c:95]: db_postgres_get_columns(): 1 columns returned from the query kamailio[5663]: DEBUG: <core> [db_res.c:156]: db_allocate_columns(): allocate 8 bytes for result names at 0x7f072f065478 kamailio[5663]: DEBUG: <core> [db_res.c:167]: db_allocate_columns(): allocate 4 bytes for result types at 0x7f072f065118 kamailio[5663]: DEBUG: db_postgres [km_res.c:112]: db_postgres_get_columns(): allocate 16 bytes for RES_NAMES[0] at 0x7f072efef9e8 kamailio[5663]: DEBUG: db_postgres [km_res.c:119]: db_postgres_get_columns(): RES_NAMES(0x7f072efef9e8)[0]=[grp] kamailio[5663]: DEBUG: db_postgres [km_res.c:154]: db_postgres_get_columns(): use DB1_STRING result type kamailio[5663]: DEBUG: db_postgres [km_res.c:200]: db_postgres_convert_rows(): no rows returned from the query kamailio[5663]: DEBUG: group [group.c:182]: is_user_in_helper(): user is not in group 'did' ```

#### SIP Traffic

<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

Since the group isn't found with the domain, the call is rejected (but the SIP traffic isn't an issue here).

### Possible Solutions

<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix. -->

### Additional Information

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

``` version: kamailio 5.1.0 (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 18:49:15 Dec 11 2017 with gcc 7.2.1 ```

* **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`) -->

``` Linux example.com 4.14.3-300.fc27.x86_64 #1 SMP Mon Dec 4 17:18:27 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux ```