Update k8s dependency version to 1.21

Signed-off-by: xinyanwu409 <wxinyan@vmware>

vendor/k8s.io/apimachinery/pkg/api/errors/OWNERS

@@ -11,8 +11,6 @@ reviewers:
 - caesarxuchao
 - mikedanese
 - liggitt
-- nikhiljindal
-- gmarek
 - erictune
 - saad-ali
 - janetkuo

vendor/k8s.io/apimachinery/pkg/api/meta/OWNERS

@@ -10,12 +10,9 @@ reviewers:
 - caesarxuchao
 - mikedanese
 - liggitt
-- nikhiljindal
-- gmarek
 - janetkuo
 - ncdc
 - dims
 - krousey
 - resouer
 - mfojtik
-- jianhuiz

vendor/k8s.io/apimachinery/pkg/api/meta/conditions.go

@@ -57,7 +57,7 @@ func SetStatusCondition(conditions *[]metav1.Condition, newCondition metav1.Cond
 // RemoveStatusCondition removes the corresponding conditionType from conditions.
 // conditions must be non-nil.
 func RemoveStatusCondition(conditions *[]metav1.Condition, conditionType string) {
-	if conditions == nil {
+	if conditions == nil || len(*conditions) == 0 {
 		return
 	}
 	newConditions := make([]metav1.Condition, 0, len(*conditions)-1)

vendor/k8s.io/apimachinery/pkg/api/resource/OWNERS

@@ -10,4 +10,3 @@ reviewers:
 - saad-ali
 - janetkuo
 - xiang90
-- mbohlool