tplink: Strip 'System Time' and 'Running Time'

[spike77453]

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

This strips the timestamps 'System Time' and 'Running Time' from the output of 'show system-info'.

[codecov-commenter]

Codecov Report

Merging #2420 (71bfa95) into master (25107e5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2420   +/-   ##
=======================================
  Coverage   63.28%   63.28%           
=======================================
  Files          30       30           
  Lines        1498     1498           
=======================================
  Hits          948      948           
  Misses        550      550           

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