[patch] VPN enhancements

[Matthew Vernon]

Hi,

This patch (mostly my work, except for protocolkeepalives, which
rjk at greenend.org.uk wrote for 2.5, and I forward-ported) came out our
usage for VPN tunnels of ssh, where it was useful for ssh to notice if
the server went away. It includes documentation, and is pretty
self-explanatory. 

Matthew
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