Mixed protocol support for Services with type=LoadBalancer (#94028)

* Mixed protocol support for Services with type=LoadBalancer

KEP: https://github.com/kubernetes/enhancements/blob/master/keps/sig-network/20200103-mixed-protocol-lb.md
Add new feature gate to control the support of mixed protocols in Services with type=LoadBalancer
Add new fields to the ServiceStatus
  Add Ports to the LoadBalancerIngress, so cloud provider implementations can report the status of the requested load balanc
er ports
  Add ServiceCondition to the ServiceStatus so Service controllers can indicate the conditions of the Service

* regenerate conflicting stuff

pkg/apis/core/validation/conditional_validation.go

@@ -0,0 +1,61 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package validation
+
+import (
+	"k8s.io/apimachinery/pkg/util/validation/field"
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	api "k8s.io/kubernetes/pkg/apis/core"
+	"k8s.io/kubernetes/pkg/features"
+)
+
+// ValidateConditionalService validates conditionally valid fields.
+func ValidateConditionalService(service, oldService *api.Service) field.ErrorList {
+	var errs field.ErrorList
+
+	errs = append(errs, validateMixedProtocolLBService(service, oldService)...)
+
+	return errs
+}
+
+// validateMixedProtocolLBService checks if the old Service has type=LoadBalancer and whether the Service has different Protocols
+// on its ports. If the MixedProtocolLBService feature flag is disabled the usage of different Protocols in the new Service is
+// valid only if the old Service has different Protocols, too.
+func validateMixedProtocolLBService(service, oldService *api.Service) (errs field.ErrorList) {
+	if service.Spec.Type != api.ServiceTypeLoadBalancer {
+		return
+	}
+	if utilfeature.DefaultFeatureGate.Enabled(features.MixedProtocolLBService) {
+		return
+	}
+
+	if serviceHasMixedProtocols(service) && !serviceHasMixedProtocols(oldService) {
+		errs = append(errs, field.Invalid(field.NewPath("spec", "ports"), service.Spec.Ports, "may not contain more than 1 protocol when type is 'LoadBalancer'"))
+	}
+	return
+}
+
+func serviceHasMixedProtocols(service *api.Service) bool {
+	if service == nil {
+		return false
+	}
+	protos := map[string]bool{}
+	for _, port := range service.Spec.Ports {
+		protos[string(port.Protocol)] = true
+	}
+	return len(protos) > 1
+}