[PATCH,VDD15Q3] Changes related to VCL temperature

[Dridi Boukelmoune]

Hi,

This is Varnish 4.1 material.

I have finally done and tested the changes we had decided to make
during the last VDD:
- removing the USE event
- allowing VMODs to fail a WARM event
- VCL reference counting for VMODs
- relaxing the "cold" restrictions on cooling VCLs

I have found and fixed more issues than anticipated after I updated my
DNS director draft to comply to the new rules. I'm happy to say that
the director is actually simpler to implement now. I have also updated
the documentation along with the code, but I may have missed some
changes and I'm running late for tonight's rehearsal :)

Best Regards,
Dridi
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