Add Multi-Cluster Management for Flux Application

[chengleqi]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Add fluxcd/multi-cluster-controller to sync the cluster.kubesphere.io/clusters and kubeconfig secret which FluxCD Application(Kustomization and HelmRelease) needed for Multi-Cluster Management.

Which issue(s) this PR fixes:

Fixes #767

Special notes for reviewers:

Please check the following list before waiting reviewers:

• [ ] Already committed the CRD files to the Helm Chart if you created some new CRDs
• [ ] Already added the permission for the new API
• [x] Already added the RBAC markers for the new controllers

Does this PR introduce a user-facing change??

None

[ks-ci-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: To complete the pull request process, please assign linuxsuren after the PR has been reviewed. You can assign the PR to them by writing /assign @linuxsuren in a comment when ready.

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[codecov[bot]]

Codecov Report

Merging #769 (4dd3258) into master (5a189fa) will increase coverage by 1.44%. The diff coverage is 83.09%.

@@            Coverage Diff             @@
##           master     #769      +/-   ##
==========================================
+ Coverage   53.70%   55.14%   +1.44%     
==========================================
  Files         181      183       +2     
  Lines       10668    10891     +223     
==========================================
+ Hits         5729     6006     +277     
+ Misses       4623     4557      -66     
- Partials      316      328      +12     

Flag	Coverage Δ
unittests	55.14% <83.09%> (+1.44%)	:arrow_up:

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

Impacted Files	Coverage Δ
controllers/fluxcd/multi-cluster-controller.go	83.09% <83.09%> (ø)
pkg/utils/net/net.go	100.00% <0.00%> (ø)
pkg/api/devops/v1alpha3/pipelinerun_types.go	38.09% <0.00%> (ø)
...rs/gitrepository/pull_request_status_controller.go	86.11% <0.00%> (ø)
.../jenkins/devopsproject/devopsproject_controller.go	43.22% <0.00%> (+2.60%)	:arrow_up:
...ns/devopscredential/devopscredential_controller.go	36.73% <0.00%> (+3.40%)	:arrow_up:
pkg/client/git/client.go	100.00% <0.00%> (+15.38%)	:arrow_up:
cmd/controller/app/options/feature.go	100.00% <0.00%> (+45.45%)	:arrow_up:
cmd/controller/app/options/options.go	100.00% <0.00%> (+100.00%)	:arrow_up:

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[lxm]

The modification of this PR includes the contents in 743. Are there any dependencies between the two PRs? If not, it should be developed based on master branch.

[chengleqi]

The modification of this PR includes the contents in 743. Are there any dependencies between the two PRs? If not, it should be developed based on master branch.

Yes, it rely on 743. I'll make this WIP.

[lxm]

This PR can be continued now. After rebase, try to remain independent of other PR

[lxm]

lgtm