support configuring system wide proxy for vsphere

[XudongLiuHarold]

Signed-off-by: Xudong Liu xudongl@vmware.com

What this PR does / why we need it

• support configuring system wide proxy for vsphere

Which issue(s) this PR fixes

Fixes #

Describe testing done for PR

Release note

users can configure system-wide proxy when vsphere as the cloud provider

Additional information

Special notes for your reviewer

[XudongLiuHarold]

/test install-vc7

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/4345/20230209033537/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/4345/20230209034515/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[XudongLiuHarold]

/test install-vc7

[codecov]

Codecov Report

Merging #4345 (492d43b) into main (1d6fbf7) will decrease coverage by 0.89%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4345      +/-   ##
==========================================
- Coverage   49.53%   48.64%   -0.89%     
==========================================
  Files         452      482      +30     
  Lines       44986    47106    +2120     
==========================================
+ Hits        22284    22917     +633     
- Misses      20580    22017    +1437     
- Partials     2122     2172      +50     

Impacted Files	Coverage Δ
...ons/controllers/packageinstallstatus_controller.go	77.99% <0.00%> (-2.32%)	⬇️
addons/controllers/addon_controller.go	63.40% <0.00%> (-2.07%)	⬇️
...lugin/isolated-cluster/fakes/client_imgpkg_fake.go	32.75% <0.00%> (ø)
cmd/cli/plugin/cluster/kubeconfig_get.go	8.82% <0.00%> (ø)
cmd/cli/plugin/cluster/set_node_pool.go	14.63% <0.00%> (ø)
...li/plugin/isolated-cluster/imgpkginterface/util.go	50.00% <0.00%> (ø)
cmd/cli/plugin/cluster/available_upgrade.go	16.32% <0.00%> (ø)
cmd/cli/plugin/cluster/scale.go	17.85% <0.00%> (ø)
cmd/cli/plugin/cluster/get_machinehealthcheck.go	11.42% <0.00%> (ø)
...olated-cluster/imagepushop/publishimagesfromtar.go	73.17% <0.00%> (ø)
... and 24 more

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[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/4345/20230209050835/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[alfredthenarwhal]

@XudongLiuHarold: /test install-vc7
Commit: 17520c3

Tests failed! Build no: 4025

[XudongLiuHarold]

/test install-vc7

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/4345/20230210005757/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[alfredthenarwhal]

@XudongLiuHarold: /test install-vc7
Commit: 1417dab

Tests failed! Build no: 4034

[XudongLiuHarold]

/test install-vc7

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/4345/20230211021446/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[alfredthenarwhal]

@XudongLiuHarold: /test install-vc7
Commit: 492d43b

Tests failed! Build no: 4039