Fix work dir nested yurthub/yurthub

[luc99hen]

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

What this PR does / why we need it:

We expect Yurthub's workdir to be /var/lib/yurthub. Currently, it is set to /var/lib/yurthub/yurthub because options.RootDir=/var/lib/yurthub by default, which is misleading for end users.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

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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

What this PR does / why we need it:

We expect Yurthub's workdir to be /var/lib/yurthub. Currently, it is set to /var/lib/yurthub/yurthub which is misleading for end users.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #1693 (5d8d39d) into master (2ed7f0f) will decrease coverage by 0.03%.
Report is 31 commits behind head on master.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1693      +/-   ##
==========================================
- Coverage   51.66%   51.64%   -0.03%     
==========================================
  Files         145      163      +18     
  Lines       17011    19748    +2737     
==========================================
+ Hits         8788    10198    +1410     
- Misses       7407     8595    +1188     
- Partials      816      955     +139     

Flag	Coverage Δ
unittests	51.64% <100.00%> (-0.03%)	⬇️

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

Files Changed	Coverage Δ
pkg/yurthub/certificate/manager/manager.go	79.10% <100.00%> (+0.64%)	⬆️

... and 125 files with indirect coverage changes

[luc99hen]

@rambohe-ch fixed

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: luc99hen, rambohe-ch

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[rambohe-ch]

/lgtm