Add checkConnected and removeEndpoint function to endpoint_manager.go
Add checkConnected and removeEndpoint function to endpoint_manager.go

AsynkronIT/protoactor-go,Huawei-PTLab/protoactor-go,rogeralsing/gam,AsynkronIT/gam,AsynkronIT/protoactor-go,Huawei-PTLab/protoactor-go,AsynkronIT/gam