[Varnish] #1579: vcc: conversion to string with + operator incomplete

[Varnish]

#1579: vcc: conversion to string with + operator incomplete
----------------------+---------------------------------
 Reporter:  slink     |      Owner:
     Type:  defect    |     Status:  new
 Priority:  normal    |  Milestone:  Varnish 4.0 release
Component:  varnishd  |    Version:  trunk
 Severity:  normal    |   Keywords:
----------------------+---------------------------------
 v00025.vtc covers tests to convert various types to strings.

 The same conversions fail if a second string is appended using the +
 operator. See lines marked with #FAIL# in stringification_fail.vtc

 A workaround is to start with an empty string and append the variable to
 be converted, see stringification_workaround.vtc

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1579>
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