[Bro] Bro cluster requirements and manager logging backlog bug

[Hovsep Levi]

It also appears that not all workers are connecting to the loggers.

This time after restarting 6 of 8 loggers are active but only 18 workers
are actively sending data.

[bro at mgr /opt/bro]$ grep worker spool/logger-*/communication.log  | awk
'{print $2}' | sort -u |grep -v logger | wc -l
      18
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