Add offline mode.
Add ethernet/wifi enable/disable functionality.
Classify each service (ethernet, wifi) into certain group.
Do some code clean up.
Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Upgrade connman to version 0.56
Modify connman-gnome to match the recent version of connman
Deprecate networkmanager
Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>