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### Description

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I'm using uac module to remote authenticate to a trunk. With the addition of ha1 used instead of plaintext password it is also would be nice to be able to use uac_reg_request_to with it.

### Expected behavior There should be auth_ha1_avp for uac module, which will use ha1 instead of plaintext to build the request #### Actual observed behavior auth_password_avp is set to empty string or dot respectively of how you specify it in database, ha1 is not used in uac_reg_request_to

### Possible Solutions

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Well logically auth_ha1_avp should be prioritized over auth_password_ha1

### Additional Information

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

``` version: kamailio 5.4.0-dev1 (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_BLACKLIST, HAVE_RESOLV_RES 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 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 10 in docker```