mainline: Logged session by IndentityKey instead of sessionID
mainline: Logged session by IndentityKey instead of sessionID

jmptrader/SuperSocket,mdavid/SuperSocket,ZixiangBoy/SuperSocket,kerryjiang/SuperSocket,fryderykhuang/SuperSocket,chucklu/SuperSocket,fryderykhuang/SuperSocket,chucklu/SuperSocket,chucklu/SuperSocket,jmptrader/SuperSocket,kerryjiang/SuperSocket,ZixiangBoy/SuperSocket,mdavid/SuperSocket,ZixiangBoy/SuperSocket,fryderykhuang/SuperSocket,mdavid/SuperSocket,jmptrader/SuperSocket,memleaks/SuperSocket