* Pod terminationGracePeriodSeconds is always valid
Validation of a pod spec will always use the pod's
TerminationGracePeriodSeconds value.
A set of pod test-helpers have been created to help construct Pods.
* remove unused func
* reduction
* reduce 2
* simplify test
* report invalid grace period
* update SupplementalGroupPolicy tests
For tracking Job Pods that have finished but are not yet counted as failed or succeeded
And feature gate JobTrackingWithFinalizers
Change-Id: I3e080f3ec090922640384b692e88eaf9a544d3b5
