[Varnish] #1824: Varnish.service should be using type=notify

[Varnish]

#1824: Varnish.service should be using type=notify
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 Reporter:  zmyrgel   |       Owner:
     Type:  defect    |      Status:  new
 Priority:  normal    |   Milestone:
Component:  varnishd  |     Version:  4.0.3
 Severity:  normal    |  Resolution:
 Keywords:  systemd   |
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Comment (by lkarsten):

 Related: -t option introduced after #1674 discussion.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1824#comment:2>
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