VIP18, change .vcc to .rst

[Poul-Henning Kamp]

I did some research on this, and created VIP18:

	https://github.com/varnishcache/varnish-cache/wiki/VIP-18:-RST-specification-for-code-generation

The origin of this proposal is that the .vcc file cannot be used as README
in a github project, but as far as my research, neither can a .rst file with
a custom ".. varnish::" directive ?

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