client should periodically reload InClusterConfig token

[mikedanese]

See kubernetes/kubernetes#70679

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle stale

[mikedanese]

/lifecycle frozen

[liggitt]

/assign @yue9944882