Management cluster plugin: Add support for extra manifests

[HanFa]

What this PR does / why we need it

Required by and cherry-picked from the Oracle Support, #3557, documented in #3600

This PR allows extra directory of manifests to be applied at bootstrap. To be used as an escape hatch for custom TKrs.

Co-authored-by: Fang Han fhan@vmware.com
Signed-off-by: Naadir Jeewa jeewan@vmware.com

Example Usage:

tanzu management-cluster create -f ~/mc.yaml --additional-tkg-system-manifests ~/tkr-oci

Which issue(s) this PR fixes

Fixes #

Describe testing done for PR

Release note

Add support for applying extra manifests during management cluster bootstrap. A directory of manifests can be applied to the tkg-system namespace just before cluster creation using `--additional-tkg-system-manifests`

Additional information

Special notes for your reviewer

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/3886/20221110010250/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/3886/20221110011611/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/3886/20221110012551/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/3886/20221110014725/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/3886/20221110023203/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]

Generally LGTM

[DanielXiao]

There are still failed checks.

[codecov]

Codecov Report

Merging #3886 (1518a16) into main (a2962f3) will decrease coverage by 0.89%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #3886      +/-   ##
==========================================
- Coverage   46.93%   46.03%   -0.90%     
==========================================
  Files         402      427      +25     
  Lines       40203    41780    +1577     
==========================================
+ Hits        18869    19234     +365     
- Misses      19582    20781    +1199     
- Partials     1752     1765      +13     

Impacted Files	Coverage Δ
tkg/client/client.go	81.25% <ø> (ø)
tkg/client/init.go	0.00% <0.00%> (ø)
tkg/clusterclient/clusterclient.go	48.27% <0.00%> (-0.39%)	⬇️
tkg/tkgctl/init.go	0.00% <0.00%> (ø)
addons/controllers/machine_controller.go	65.65% <0.00%> (-3.04%)	⬇️
...ons/controllers/packageinstallstatus_controller.go	77.99% <0.00%> (-1.16%)	⬇️
cmd/cli/plugin/cluster/osimage_oracle.go	3.20% <0.00%> (ø)
...in/cluster/get_machinehealthcheck_control_plane.go	11.11% <0.00%> (ø)
...md/cli/plugin/cluster/delete_machinehealthcheck.go	19.23% <0.00%> (ø)
cmd/cli/plugin/cluster/set_node_pool.go	14.63% <0.00%> (ø)
... and 23 more

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[HanFa]

There are still failed checks.

looks like it is flake from CAPD pipeline. it succeeds after retry