network: update DisconnectDevice()
network: add utils_nm.go, helper functions to dispatch network manager device and connection
network: change wired connections behavior, add GetWiredConnectionUuid()
network: add early code for vpn
network: add early code for pppoe
network: update autogen code, add code to set json value generally
network: update code for field pppoe and ppp
network: add support for pppoe
network: udpate ActivateConnection(), fix issue that access point connection will be activate by network manager automatic