mainline: improved certificate loading API
mainline: improved certificate loading API

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