mod_lastlog2: Skip initializing internal API (and storage) in prosodyctl Initializing storage in the global context under prosodyctl causes the module.command to fail to execute because the storage module has already been loaded. Introduced in 7b722955c59b

This module writes out a traceback to `traceback.txt` in Prosodys data
directory (see `prosodyctl about`) when the signal `SIGUSR1` is
received. This is useful when debugging seemingly frozen instances in
case it is stuck in Lua code.