fail2ban / fail2ban / 3729 / 2

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travis-ci

shutdown sockets before close, avoid socket leakage by use of the explicit socket close in async_chat;
better error handling with error counting, differentiate special case ([Errno 24] Too many open files), with resulting stop of the server
(avoid flood the log file, closes gh-991 and similar issues);
restored auto-garbage, because of non-reference-counting python's (like pypy), otherwise it may leak there on objects like unix-socket, etc.

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