[Varnish] #1225: bans_req counter doesn't take into account bans loaded from persistent silos

[Varnish]

#1225: bans_req counter doesn't take into account bans loaded from persistent
silos
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 Reporter:  martin    |      Owner:
     Type:  defect    |     Status:  new
 Priority:  normal    |  Milestone:
Component:  varnishd  |    Version:  trunk
 Severity:  normal    |   Keywords:
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 On BAN_Reload, bans from persistent silos that references req.* values
 won't increment the bans_req counter. This causes the counter to wrap
 below zero when these bans are removed.

 See attached test case.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1225>
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