[Varnish] #1652: Vary: * should be handled in core

[Varnish]

#1652: Vary: * should be handled in core
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 Reporter:  slink     |      Owner:
     Type:  defect    |     Status:  new
 Priority:  normal    |  Milestone:
Component:  varnishd  |    Version:  trunk
 Severity:  normal    |   Keywords:
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 Currently, all of the Vary Handling happens in core code, except for
 {{{Vary: *}}}, which is handled in {{{builtin.vcl}}} and creates a hitpass
 object. Core code treats {{{*}}} like any other header name.

 For consistency, {{{Vary: *}}} should be handled in Core code also.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1652>
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