[Varnish] #1725: backend_conn is no longer incremented

[Varnish]

#1725: backend_conn is no longer incremented
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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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 backend_conn was lost during the backend code rewrite.

 We should bring the counter back.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1725>
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