test TAP device config before trying to connect (#309)
test TAP device config before trying to connect (#309)


Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client,Jigsaw-Code/outline-client