bugfix: add client auth key usage to yurt-tunnel-server certmanager

[DrmagicE]

/kind bug

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
/sig storage

What this PR does / why we need it:

The key usage certificates.UsageClientAuth is missing from yurt-tunnel-server certmanager.

Which issue(s) this PR fixes:

Fixes #508

Special notes for your reviewer:

/assign @SataQiu @rambohe-ch

Does this PR introduce a user-facing change?

other Note

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In response to this:

/kind bug

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
/sig storage

What this PR does / why we need it:

The key usage certificates.UsageClientAuth is missing from yurt-tunnel-server certmanager.

Which issue(s) this PR fixes:

Fixes #508

Special notes for your reviewer:

/assign @SataQiu @rambohe-ch

Does this PR introduce a user-facing change?

other Note

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[rambohe-ch]

/lgtm
/approve

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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