Fix emit/remove for once function in event module
Fix emit/remove for once function in event module

IoT.js-DCO-1.0-Signed-off-by: Chunseok Lee chunseok.lee@samsung.com

gertom/iotjs,chunseoklee/iotjs,ILyoan/iotjs,wateret/iotjs,VandeurenGlenn/iotjs,qdk0901/iotjs,lemmaa/iotjs,lemmaa/iotjs,gertom/iotjs,wateret/iotjs,bozzmob/iotjs,chunseoklee/iotjs,qdk0901/iotjs,gertom/iotjs,diorahman/iotjs,ILyoan/iotjs,chunseoklee/iotjs,diorahman/iotjs,ILyoan/iotjs,wateret/iotjs,qdk0901/iotjs,VandeurenGlenn/iotjs,lemmaa/iotjs,bozzmob/iotjs,VandeurenGlenn/iotjs,diorahman/iotjs,bozzmob/iotjs