Implement forking/master role checking in masterd
This patch adds checks for the master role and daemonize support to ganeti-masterd. The patch modifies the startup/shutdown of the server because: - we want bind()/listen() to the master socket to occur before forking so that we can return a correct exit code and write messages to stderr - but we want thread startup to occur after fork(), otherwise python threading gets confused The patch also has some small cleanups: - remove the unix socket after closing it, so we don't need to remove it manually - instead of just telling the threads to terminate via the new_queue, we also join() them so that the logs show what thread clinging to life - the daemon logs to its own logfile now - there is command line parameter support :) Reviewed-by: imsnah
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