fix: compatible with k8s 1.16 api

[jiangytcn]

support kube api 1.16+

part of jenkins-x/jx#6385

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[jenkins-x-bot]

Hi @jiangytcn. Thanks for your PR.

I'm waiting for a jenkins-x-charts or jenkins-x member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[abayer]

These changes are also in #44, fyi.

[jiangytcn]

thanks @abayer