Add flag completion for ks install command

[LinuxSuRen]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@893e70a). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master    #207   +/-   ##
========================================
  Coverage          ?   9.22%           
========================================
  Files             ?      32           
  Lines             ?    1387           
  Branches          ?       0           
========================================
  Hits              ?     128           
  Misses            ?    1249           
  Partials          ?      10           

Flag	Coverage Δ
unittests	9.22% <0.00%> (?)

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