yurthub verify bootstrap ca on start

[gnunu]

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/kind bug
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/kind bug

What this PR does / why we need it:

verify existed ca file if any, and do cleanup if necessary (mismatch). This will fix the openyurt convert failure due to stale contents left over in the yurthub root dir (/var/lib/yurthub).

Which issue(s) this PR fixes:

Fixes #

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/assign @rambohe-ch

Does this PR introduce a user-facing change?

NONE

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
/sig storage

/kind bug

What this PR does / why we need it:

verify existed ca file if any, and do cleanup if necessary (mismatch). This will fix the openyurt convert failure due to stale contents left over in the yurthub root dir (/var/lib/yurthub).

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

/assign @rambohe-ch

Does this PR introduce a user-facing change?

NONE

other Note

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[rambohe-ch]

@gnunu A good job to remove pki based on verifying join token. please fix the above golangci lint error.

[gnunu]

@rambohe-ch thanks!

[rambohe-ch]

@gnunu I think that maybe we can compare the remote server address from yurthub startup parameter --serveraddr and server address of /var/lib/yurthub/bootstrap-hub.conf. if yurthub is used to connect to a new kube-apiserver, the remote server address will be changed, so the old certificates should be removed.

[rambohe-ch]

/lgtm
/approve

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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