Move tun.c into the module's own directory, since it is specific to the
module subsystem.

Add a dummy "tun" module, whose only job is to trigger an autoload of
required module "if_tun". This allows access to /dev/tunN to autload
the require interface module.

XXX There's might be a bette

Add a dummy "tun" module, whose only job is to trigger an autoload of
required module "if_tun". This allows access to /dev/tunN to autload
the require interface module.

XXX There's might be a better place/name for net/tun.c

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