[Varnish] #1512: Changes to bereq are lost between v_b_r and v_b_f

[Varnish]

#1512: Changes to bereq are lost between v_b_r and v_b_f
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 Reporter:  fgsch   |      Owner:
     Type:  defect  |     Status:  new
 Priority:  normal  |  Milestone:
Component:  build   |    Version:  trunk
 Severity:  normal  |   Keywords:
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 See attached testcase.

 If a header is added to bereq and v_b_r returns retry the header is lost
 in v_b_f. It should maintain keep the header between restarts.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1512>
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