add support of reading certificate-authority file

[linux-foundation-easycla[bot]]

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• :white_check_mark: login: swhoro (79ab588d74b5170108058f2e9a1b18bc39a6f422)

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[swhoro]

/easycla

[ityuhui]

/lgtm /approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ityuhui, swhoro

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