improve ca data for yurthub component

[rambohe-ch]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:
/kind bug
/kind documentation
/kind enhancement
/kind good-first-issue
/kind feature
/kind question
/kind design
/sig ai
/sig iot
/sig network
/sig storage

/kind enhancement

What this PR does / why we need it:

add function GetCAData() to improve ca file preparation for yurthub component.

Which issue(s) this PR fixes:

Fixes #1782

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

[openyurt-bot]

@rambohe-ch: GitHub didn't allow me to assign the following users: your_reviewer.

Note that only openyurtio members, repo collaborators and people who have commented on this issue/PR can be assigned. Additionally, issues/PRs can only have 10 assignees at the same time.
For more information please see the contributor guide

In response to this:

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:
/kind bug
/kind documentation
/kind enhancement
/kind good-first-issue
/kind feature
/kind question
/kind design
/sig ai
/sig iot
/sig network
/sig storage

/kind enhancement

What this PR does / why we need it:

add function GetCAData() to improve ca file preparation for yurthub component.

Which issue(s) this PR fixes:

Fixes #1782

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[codecov]

Codecov Report

Attention: 392 lines in your changes are missing coverage. Please review.

Comparison is base (15bd83b) 52.22% compared to head (e05b7e5) 52.15%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
pkg/yurthub/storage/disk/storage.go	0.00%	29 Missing ⚠️
pkg/yurthub/yurtcoordinator/coordinator.go	0.00%	28 Missing ⚠️
pkg/yurthub/cachemanager/cache_manager.go	31.42%	24 Missing ⚠️
pkg/yurthub/certificate/token/token.go	0.00%	17 Missing ⚠️
...publicservice/gateway_public_service_controller.go	0.00%	14 Missing ⚠️
...troller/nodelifecycle/node_lifecycle_controller.go	0.00%	13 Missing ⚠️
pkg/yurttunnel/trafficforward/dns/dns.go	23.52%	13 Missing ⚠️
...n/gatewaypickup/gateway_pickup_enqueue_handlers.go	0.00%	12 Missing ⚠️
...yurthub/yurtcoordinator/certmanager/certmanager.go	15.38%	11 Missing ⚠️
pkg/yurthub/storage/etcd/keycache.go	25.00%	9 Missing ⚠️
... and 61 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1815      +/-   ##
==========================================
- Coverage   52.22%   52.15%   -0.07%     
==========================================
  Files         172      172              
  Lines       20840    20863      +23     
==========================================
- Hits        10884    10882       -2     
- Misses       8999     9021      +22     
- Partials      957      960       +3     

Flag	Coverage Δ
unittests	52.15% <7.98%> (-0.07%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sonarqubecloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
3.2% Duplication

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[YTGhost]

/lgtm

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rambohe-ch, YTGhost

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [rambohe-ch]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment