rec: Wait until after daemonizing to start the RPZ and protobuf threads

rec: Wait until after daemonizing to start the RPZ and protobuf threads

Otherwise they are killed when we call `fork()`.
We still want to actually parse the configuration to check for syntax
errors before daemonizing to be able to report any error, so when
`daemon` is set to `yes`, we parse the Lua configuration early
without starting any threads, and then again, starting the threads
that time, after daemonizing.

(cherry picked from commit a4241908a1c80c4293cfcd5056bb67138958f0e6)