Test to verify ssh-key value contains comment using an username

[kgaikwad]

Added test as discussed on PR-455

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@6547d5a). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #470   +/-   ##
=========================================
  Coverage          ?   88.95%           
=========================================
  Files             ?      339           
  Lines             ?     5633           
  Branches          ?        0           
=========================================
  Hits              ?     5011           
  Misses            ?      622           
  Partials          ?        0

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[Temikus]

Excellent! Thank you!