### Description

When I try to load kamailio schema into MySQL database I get an error "Duplicate entry 'dialog_vars' for key 'PRIMARY'". I have checked the duplicated `dialog_vars` table definition at 1. [dialog-create.sql#L32-L38](https://github.com/kamailio/kamailio/blob/master/utils/kamctl/mysql/dialog-c...) 2. [ims_dialog-create.sql#L41-L49](https://github.com/kamailio/kamailio/blob/master/utils/kamctl/mysql/ims_dial...)

#### Reproduction Load schemas from dialog-create.sql and from ims_dialog-create.sql.

### Possible Solutions Remove `dialog_vars` table definition from `ims_dialog-create.sql` shema file.

### Additional Information

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

``` @safarov-dell:/usr/share/kamailio$ kamailio -v version: kamailio 5.5.0-dev3 (x86_64/linux) flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, 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_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, 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 12:51:16 Dec 4 2020 with gcc 10.2.1 ```

* **Operating System**:

``` @safarov-dell:/usr/share/kamailio$ cat /etc/os-release NAME="Alpine Linux" ID=alpine VERSION_ID=3.13.0_alpha20200917 PRETTY_NAME="Alpine Linux edge" HOME_URL="https://alpinelinux.org/" BUG_REPORT_URL="https://bugs.alpinelinux.org/" ```