[Varnish] #1590: ESI does not handle C-L 0 and C-E gzip

[Varnish]

#1590: ESI does not handle C-L 0 and C-E gzip
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 Reporter:  fgsch   |      Owner:
     Type:  defect  |     Status:  new
 Priority:  normal  |  Milestone:
Component:  build   |    Version:  unknown
 Severity:  normal  |   Keywords:
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 This case is handled in the non-esi path but not in ESI.

 Patch attached.

 This also converts some checks into asserts as the VFP code won't be
 pushed in those situations.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1590>
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