[Varnish] #1496: vsl_mask is annoying to use from varnishadm commandline

[Varnish]

#1496: vsl_mask is annoying to use from varnishadm commandline
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 Reporter:  dormando  |       Type:  defect
   Status:  new       |   Priority:  normal
Milestone:            |  Component:  varnishadm
  Version:  unknown   |   Severity:  normal
 Keywords:            |
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 varnishadm -T :6082 param.set vsl_mask "-Voo,-Var"

 will say something like "Unknown command -V"

 Backslashing it doesn't help either:
 $ varnishadm -T :6082 param.set vsl_mask
 "\-VCL_trace,\-WorkThread,\-Hash,\-ReqHeader"
 Unknown request.
 Type 'help' for more info.
 Syntax Error: Invalid backslash sequence

 I'm sure there's some way to do it, but it's not obvious and typical.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1496>
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