Exclude caBundle field when cert-manager is enabled

[juldou]

What this PR does / why we need it:
It fixes the issue mentioned below. caBundle field should be excluded when using cert-manager.

Which issue(s) this PR fixes:
Fixes #3806

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[seldondev]

Hi @juldou. Thanks for your PR.

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[juldou]

/assign @majolo

[majolo]

lgtm, thanks for contributing @juldou !

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: majolo

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