Change log for v3.11.1716:
[IMP] Replaced libhttpd with libevent, therefore commented thread
related parameters in  wifidogx conf file
[IMP] Added REQUEST_TYPE_COUNTERS_V2 to wifidog protocol
[IMP] Sent online and offline client's counter info to auth server

[FIX] Fixed missing setting online_time parameter bug

Signed-off-by: Dengfeng Liu <liudf0716@gmail.com>