add makenode config to connect a home node to internet via wifi

[jhpoelen]

Currently, makenode assumes that a node has a wired internet connection to dig a tunnel to the exit node.

Suggested, via mailing list (see below), is to add configuration to allow nodes to dig tunnels through a wireless access point connection (e.g., hotspot)

We had a request for how to connect a home node to internet via wifi instead of via ethernet. This is not currently supported using the built-in web ui so i wrote up a short guide:

  https://gist.github.com/Juul/957855bb5841100109eaeb90e8c6b01b

I'll either improve it a bit and add to wiki or maybe turn it into a script.

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marc/juul