Kubeconfig allow certificate_authority_data not present in ExecAuthCluster

[ljun20160606]

Motivation

#1431

Solution

I found if we use #[serde(with = "module")]. It will check if field is present. Let's check on serde-rs/serde#1728. We can add #[serde(default)] to fix this.

[clux]

hey, thanks for this, looks like an oversight, happy to merge, but are you able to --signoff the commit? (see DCO check)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.3%. Comparing base (77852d9) to head (8fa8ad1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1432     +/-   ##
=======================================
+ Coverage   72.3%   72.3%   +0.1%     
=======================================
  Files         76      76             
  Lines       6527    6528      +1     
=======================================
+ Hits        4717    4718      +1     
  Misses      1810    1810             

Files	Coverage Δ
kube-client/src/config/file_config.rs	75.5% <ø> (ø)

... and 1 file with indirect coverage changes

[ljun20160606]

hey, thanks for this, looks like an oversight, happy to merge, but are you able to --signoff the commit? (see DCO check)

Done.