mod_s2s_auth_dane: Fix traceback in DANE-TA check because unpack() moved It moved into the table package in Lua 5.2, error happens when compat is disabled or gone (ie 5.3+). This happened in DANE-TA, which is disabled by default.

This module lets you block connections to remote servers at the s2s
level.

``` {.lua}
s2s_blacklist = {
    "proxy.eu.jabber.org",
}
```