Original TTL has not been set.

the module can enforce RPZ from zone file, later a LMDB binary database
is going to come to solve following:
- updating zones on the fly
- instant startup (although it loads 1M blocklist in a fraction of
second)
- no extra memory usage between multiple processes
the compatibility notes are in the documentation

module can identify clients based on their source address or used TSIG
key

the requestor can provide information identifying the query originator
here (address and TSIG key), both fields are optional
update Lua FFI bindings

fixes killing the server with SIGKILL causing abortiong,
added SIGTERM handler and ignored retcode from uv_run()