[Varnish] #940: For gzip and un-gzip: Change ETags and add Vary (was: ETag for gzip'd variant identical to ETag of ungzipped variant.)

[Varnish]

#940: For gzip and un-gzip: Change ETags and add Vary
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 Reporter:  david     |       Owner:  phk
     Type:  defect    |      Status:  new
 Priority:  high      |   Milestone:
Component:  build     |     Version:  3.0.0
 Severity:  critical  |  Resolution:
 Keywords:            |
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Changes (by slink):

 * owner:  martin => phk


Comment:

 We have made the decision documented in [wiki:Etags]:

 * Remove `Etag` on way out for un-gzip
 * Make `Etag` `W/"eak"` on way out for gzip
 * Add `Vary: Accept-Encoding` for gzip

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/940#comment:15>
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