### Description
We tried to use the `xhttp_prom` module, but our Prometheus couldn't read it, because of metrics conflicting with Prometheus data model.
For us, the problem lies in the usrloc module. It exports the following metrics:
```
usrloc:location-contacts = 0
usrloc:location-expires = 0
usrloc:location-users = 0
usrloc:registered_users = 0
```
However, Prometheus allows only ascii characters and digits, as well as underscores and colons.
See: https://prometheus.io/docs/concepts/data_model/#metric-names-and-labels
The metrics names should not contain `-`, so they should get converted to `_`.
#### Reproduction
Setup Kamailio with `usrloc`, `xhttp` and `xhttp_prom` module and let Prometheus query it. It will stumble upon the first entry of `usrloc` module stats.
### Possible Solutions
Either the `usrloc` module could export its stats with the dash replaced by underscores, or the xhttp_prom module could sanitize the output. The first one would be a breaking change, I guess, making this a change for a major release.
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
root@ifens5:/# kamailio -v
version: kamailio 5.3.8 (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, 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 with gcc 7.5.0```
* **Operating System**:
```
Ubuntu 18.04
```
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### Description
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Sometimes need to add rport on outbound uac reg, but seems it's not possible in the current uac module. Would be good to an an extra param to do it, or is it possible to trigger a KEMI event route so a script can add whatever it need before sending the register msg?
Thanks.
### Expected behavior
#### Actual observed behavior
#### Debugging Data
```
(paste your debugging data here)
```
#### Log Messages
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### Possible Solutions
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### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
(paste your output here)
```
* **Operating System**:
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```
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```
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