add delay between reconnecting (debian bug 749650)
Originally reported against the debian irker package here: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=749650
The issue is that, in some circumstances, irker will continually attempt to reconnect without any significant delay between connection attempts, leading to the machine irker is running on being throttled. Based on the bug report and local experimentation, this only happens when the server immediately disconnects irker after a failure.
Adding some delay between reconnection attempts in this situation seems like the polite thing to do here.