nat: Provide access to /dev/urandom for the code

Instead of doing open/read/close all the time, open the
FD in the beginning and keep it open. To scare me even
more I have seen /dev/urandom actually providing a short
read and then blocking but it seems to be the best way
to get the random byes we need for authentication.

So one should/could run the cheap random generator on
the system (e.g. haveged) or deal with the NAT process
to block.

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