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This patch change the log format from:

2016-03-25 04:26:37,609 WARNING access 172.17.0.2 - Anonymous [25/Mar/2016:04:26:37 +0200] "GET / HTTP/1.0" 200 0 "" ""
------
2016-03-25 04:26:37,613 WARNING access 172.17.0.2 - Anonymous [25/Mar/2016:04:26:37 +0200] "GET / HTTP/1.0" 200 1971 "" ""
------
2016-03-25 04:26:37,619 WARNING access 172.17.0.2 - Anonymous [25/Mar/2016:04:26:37 +0200] "GET / HTTP/1.1" 200 1952 "" ""
------
2016-03-25 04:26:40,619 WARNING access 172.17.0.2 - Anonymous [25/Mar/2016:04:26:40 +0200] "GET / HTTP/1.0" 200 1971 "" ""
------
2016-03-25 04:26:43,622 WARNING access 172.17.0.2 - Anonymous [25/Mar/2016:04:26:43 +0200] "GET / HTTP/1.0" 200 1971 "" ""

to something more concise for the eye:

2016-04-06 10:13:41,854 WARNING access 172.17.0.2 - Anonymous [06/Apr/2016:10:13:41 +0200] "GET / HTTP/1.0" 200 1971 "" ""
2016-04-06 10:13:44,861 WARNING access 172.17.0.2 - Anonymous [06/Apr/2016:10:13:44 +0200] "GET / HTTP/1.0" 200 1971 "" ""
2016-04-06 10:13:47,868 WARNING access 172.17.0.2 - Anonymous [06/Apr/2016:10:13:47 +0200] "GET / HTTP/1.0" 200 1971 "" ""
2016-04-06 10:13:50,875 WARNING access 172.17.0.2 - Anonymous [06/Apr/2016:10:13:50 +0200] "GET / HTTP/1.0" 200 1971 "" ""
2016-04-06 10:13:53,882 WARNING access 172.17.0.2 - Anonymous [06/Apr/2016:10:13:53 +0200] "GET / HTTP/1.0" 200 1971 "" ""
2016-04-06 10:13:56,890 WARNING access 172.17.0.2 - Anonymous [06/Apr/2016:10:13:56 +0200] "GET / HTTP/1.0" 200 1971 "" ""

by changing the log format from the default ------\n%(asctime)s %(levelname)s %(name)s %(message)s ( defined here) to simply %(asctime)s %(levelname)s %(name)s %(message)s

It is enabled for both event.log and Z2.log

/cc @kazuhiko @vpelletier @tc