Rebase allow updates to pdbs to latest upstream master

pkg/apis/policy/validation/validation.go

@@ -19,7 +19,6 @@ package validation
 import (
 	"fmt"
 	"path/filepath"
-	"reflect"
 	"regexp"
 	"strings"
 
@@ -43,14 +42,10 @@ func ValidatePodDisruptionBudget(pdb *policy.PodDisruptionBudget) field.ErrorLis
 }
 
 func ValidatePodDisruptionBudgetUpdate(pdb, oldPdb *policy.PodDisruptionBudget) field.ErrorList {
-	allErrs := field.ErrorList{}
-
 	restoreGeneration := pdb.Generation
 	pdb.Generation = oldPdb.Generation
 
-	if !reflect.DeepEqual(pdb.Spec, oldPdb.Spec) {
-		allErrs = append(allErrs, field.Forbidden(field.NewPath("spec"), "updates to poddisruptionbudget spec are forbidden."))
-	}
+	allErrs := ValidatePodDisruptionBudgetSpec(pdb.Spec, field.NewPath("spec"))
 	allErrs = append(allErrs, ValidatePodDisruptionBudgetStatus(pdb.Status, field.NewPath("status"))...)
 
 	pdb.Generation = restoreGeneration