Add label for priority class in kube_pod_info #712

[chenk008]

Add label for priority class in kube_pod_info

Fixes #712

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[chenk008]

cc @brancz

[brancz]

/lgtm
/hold

@mxinden’s call whether to merge now or after 1.6 release.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brancz, chenk008

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[mxinden]

/hold cancel