[Catalyst] PATCH: code improvements relating to server restart

[Mark Stosberg]

As I studied the code relating to server restarting, I made a few small 
refactors to the related documentation to make the code clearer and easier to 
follow. The result should be functionally the same. A patch is attached which 
supplies the following updates. It may depend on related patch I submitted 
earlier. 

 * Improve the code clarity by encapsulating server restart permissions code 
in its own subroutine
  * document "_inet_addr"
  * document where inet_aton comes from
  * clarify $ip vs $ipaddr variable names.
      One is a $remote_ip, the other is an $allowed_ip
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