change method type to private and make the naming consistent
change method type to private and make the naming consistent

gauravsingh0110/ovx_vsdn,mgerola/OpenVirteX,opennetworkinglab/OpenVirteX,mgerola/OpenVirteX,mgerola/OpenVirteX,opennetworkinglab/OpenVirteX,gauravsingh0110/ovx_vsdn,opennetworkinglab/OpenVirteX,gauravsingh0110/ovx_vsdn