[Varnish] #1581: Duplicate SLT_Begin log records

[Varnish]

#1581: Duplicate SLT_Begin log records
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 Reporter:  daghf     |       Owner:
     Type:  defect    |      Status:  new
 Priority:  normal    |   Milestone:
Component:  varnishd  |     Version:  trunk
 Severity:  normal    |  Resolution:
 Keywords:            |
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Comment (by daghf):

 With good help from Martin, we found that this behavior can only be
 triggered in the case of a client being slow at transmitting the request
 after connect. This was the case with lwp-request on a 4 yr old thinkpad.

 I've attached a test case we came up with that consistently reproduces the
 behavior by including a tiny delay just prior to sending the request.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1581#comment:1>
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