Replace deprecated ioutil package

[dereknola]

Signed-off-by: Derek Nola [email protected]

Proposed Changes

• Most functions in ioutil package was deprecated in go 1.16 and even more in 1.17. This PR replaces all deprecated functions from ioutil with their replacements. Most are a drop in name change, but ioutil.ReadDir -> os.ReadDir required a bit more change.
• Fixes flaky secrets encrypt rotation test

Types of Changes

Deprecation package replacement.

Verification

make passes

Testing

N/A

Linked Issues

#6231

User-Facing Change

Further Comments

[codecov-commenter]

Codecov Report

Base: 9.74% // Head: 9.76% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (4fbef71) compared to base (b44d81a).
Patch coverage: 15.05% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #6230      +/-   ##
=========================================
+ Coverage    9.74%   9.76%   +0.01%     
=========================================
  Files         139     139              
  Lines       10120   10130      +10     
=========================================
+ Hits          986     989       +3     
- Misses       8932    8937       +5     
- Partials      202     204       +2     

Flag	Coverage Δ
unittests	9.76% <15.05%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/agent/config/config.go	0.00% <0.00%> (ø)
pkg/agent/containerd/config_linux.go	0.00% <0.00%> (ø)
pkg/agent/containerd/containerd.go	0.00% <0.00%> (ø)
pkg/agent/loadbalancer/config.go	33.33% <0.00%> (ø)
pkg/agent/run_linux.go	0.00% <0.00%> (ø)
pkg/bootstrap/bootstrap.go	20.51% <0.00%> (ø)
pkg/cgroups/cgroups_linux.go	0.00% <0.00%> (ø)
pkg/cli/cert/cert.go	0.00% <0.00%> (ø)
pkg/cli/secretsencrypt/secrets_encrypt.go	0.00% <0.00%> (ø)
pkg/clientaccess/kubeconfig.go	0.00% <0.00%> (ø)
... and 22 more

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[VestigeJ]

LGTM