Fix generated openapi spec

[djoyahoy]

• Use string type for lastTransitionTime in the Condition schema as it does custom json encoding/decoding
• Fix cluster object template for patches

[djoyahoy]

Should generating the openAPI spec be documented, and if so, where?

[codecov-commenter]

Codecov Report

Merging #497 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #497   +/-   ##
=======================================
  Coverage   67.61%   67.61%           
=======================================
  Files          74       74           
  Lines        3418     3418           
=======================================
  Hits         2311     2311           
  Misses        836      836           
  Partials      271      271           

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