[sr-dev] [kamailio/kamailio] registrar: fix xavp_rcd memory consumption (#1111)

[lazedo]

@miconda thanks for the info.
after digging more , i think the issue is not related to `kazoo`. can you try the below script (note that kazoo is not used) ? also maybe fake a transaction to a external auth and set the `$xavp(ulattrs=>extra_info)` on the `continue`block ?
with this configuration, the 1st registration doesn't leak but the re-registrations do leak.

```
...
modparam("usrloc", "xavp_contact", "ulattrs")
modparam("registrar", "xavp_rcd", "ulrcd")
modparam("registrar", "xavp_cfg", "regcfg")
modparam("htable", "htable", "auth_cache=>size=16;autoexpire=7200;")
...

route[REGISTRAR]
{

    $xavp(regcfg=>match_received) = $su;
    if($sht(auth_cache=>$Au) != $null && registered("location", "$rz:$Au", 2, 1) == 1) {
        xlog("L_INFO", "$ci|register|found cached registration for $rz:$Au\n");
            $var(password) = $sht(auth_cache=>$Au);
            route(SAVE_LOCATION);
    }

    if( !is_present_hf("Authorization")) {
        auth_challenge("$fd", "0");
        exit();
    }
    
    $xavp(ulattrs=>extra_info) = '{"test" : true}';
    
    route(SAVE_LOCATION);

}

route[SAVE_LOCATION]
{

    if ($sht(auth_cache=>$Au) == $null) {
        xlog("L_INFO", "$ci|log|caching sip credentials for $Au\n");
    };
    $sht(auth_cache=>$Au) = $var(password);
    $var(save_result) = save("location", "0x04");
    if($var(save_result) == -1) {
        auth_challenge("$fd", "0");
        xlog("L_INFO", "$ci|end|issued auth challenge after failed attempt to save contact for $Au $si:$sp\n");
        exit;
    } else {
        if($var(save_result) == 1) {
            $var(new_reg) = "true";
        } else {
           $var(new_reg) = "false";
        }
    }
    xlog("L_INFO", "$ci|end|save result $var(save_result) with contact $xavp(ulrcd=>ruid) : $ct\n");
}
```



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