* restructure tests
restructure TestValidateStatefulSet and TestValidateStatefulSetUpdate to be an array and accept list of expected errors. in this commits, no tests were changed and expected errors are not filled yet
* add expected errors
adding expected errors and making the tests pass, without making any changes to the tests
* clean up TestValidateStatefulSet error cases
* clean up TestValidateStatefulSetUpdate cases
* validate new statefulset as part of update validation
* address PR comments
When the StatefulSetMinReadySeconds feature gate is disabled,
the registry and validation must properly handle dropping the
minReadySeconds and AvailableReplicas fields
When the maxsurge daemonset gate is disabled, the registry and validation
must properly handle stripping the field. In the special case where that
would leave the MaxUnavailable field set to 0, we must set it to 1 which
is the default value.
Implements history utilities for ControllerRevision in the controller/history package
StatefulSetStatus now has additional fields for consistency with DaemonSet and Deployment
StatefulSetStatus.Replicas now represents the current number of createdPods and StatefulSetStatus.ReadyReplicas is the current number of ready Pods
The alpha field podManagementPolicy defines how pods are created,
deleted, and replaced. The new `Parallel` policy will replace pods
as fast as possible, not waiting for the pod to be `Ready` or providing
an order. This allows for advanced clustered software to take advantage
of rapid changes in scale.
