[Bug 1304496] [NEW] add --version to squid3

[Karl-Philipp Richter]

Public bug reported:

It would be helpful to have a --version parameter for the squid3 command
printing the current version of the binary.

** Affects: squid3 (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  add --version to squid3

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