model vyatta: hide wireguard private-key and preshared-key

[gauthierl]

Pre-Request Checklist

• Passes rubocop code analysis (try rubocop --auto-correct)
• Tests added or adapted (try rake test)
• Changes are reflected in the documentation
• User-visible changes appended to CHANGELOG.md

Description

The patch hide secrets of WireGuard interfaces in vyatta / vyos :

I was not able to try Rubocop and rake test. I'm not used to these tools and didn't manage to use them.

I tried this patch on our instance of Oxidized and the patch produce this change on VyOS 1.5 :

-set interfaces wireguard wg0 peer mypeer preshared-key 'DFpH6vrTlXczS/eHFUt+rddmE7zRaeQ1oCiprVGwzXs='
+set interfaces wireguard wg0 peer mypeer preshared-key <secret removed>
set interfaces wireguard wg0 peer mypeer public-key 'qu3a1Dus/jaE4QM6qIUWaF/Jdktg8+FyMssicDMsu1Y='
set interfaces wireguard wg0 port '43521'
-set interfaces wireguard wg0 private-key 'SCcDxY9eldGfQKlncqtPifGw0JHtedszS89V5BpTQWM='
+set interfaces wireguard wg0 private-key <secret removed>

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.49%. Comparing base (6e27165) to head (526f3a8).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3099   +/-   ##
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  Coverage   65.49%   65.49%           
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  Files          34       34           
  Lines        1649     1649           
=======================================
  Hits         1080     1080           
  Misses        569      569           

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[robertcheramy]

Thank you for your PR. It has passed Rubocup, cheers :-)

For next PR:

• Here is how to test & run your code against rubocup: https://github.com/ytti/oxidized/blob/master/CONTRIBUTING.md#create-a-ruby-bundle
• You should document your changes CHANGELOG.md - as this is a small change, I will merge it right away.