[VOL-1866] Changed module dependency to v12.0.0 of k8s client-go and v1.15.4 of k8s api/apimachinery in sync with other voltha components

Had to use pseudo-version corresponding to v12.0.0 of k8s client-go
because golang proxy is no longer serving the modules not complying
to Semantic Import Versioning rules including client-go v12.0.0.
Refer to https://github.com/kubernetes/client-go/issues/631 and
https://github.com/golang/go/issues/33558

Change-Id: I2e558bab7f0702f230761319eb5392a7d0532ea3
diff --git a/vendor/k8s.io/api/rbac/v1/doc.go b/vendor/k8s.io/api/rbac/v1/doc.go
index 76899ef..80f43ce 100644
--- a/vendor/k8s.io/api/rbac/v1/doc.go
+++ b/vendor/k8s.io/api/rbac/v1/doc.go
@@ -15,6 +15,7 @@
 */
 
 // +k8s:deepcopy-gen=package
+// +k8s:protobuf-gen=package
 // +k8s:openapi-gen=true
 
 // +groupName=rbac.authorization.k8s.io
diff --git a/vendor/k8s.io/api/rbac/v1/generated.proto b/vendor/k8s.io/api/rbac/v1/generated.proto
index 4b321a7..71fa083 100644
--- a/vendor/k8s.io/api/rbac/v1/generated.proto
+++ b/vendor/k8s.io/api/rbac/v1/generated.proto
@@ -43,6 +43,7 @@
   optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;
 
   // Rules holds all the PolicyRules for this ClusterRole
+  // +optional
   repeated PolicyRule rules = 2;
 
   // AggregationRule is an optional field that describes how to build the Rules for this ClusterRole.
@@ -121,6 +122,7 @@
   optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;
 
   // Rules holds all the PolicyRules for this Role
+  // +optional
   repeated PolicyRule rules = 2;
 }
 
diff --git a/vendor/k8s.io/api/rbac/v1/types.go b/vendor/k8s.io/api/rbac/v1/types.go
index 17163cb..7ba7d05 100644
--- a/vendor/k8s.io/api/rbac/v1/types.go
+++ b/vendor/k8s.io/api/rbac/v1/types.go
@@ -108,6 +108,7 @@
 	metav1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
 
 	// Rules holds all the PolicyRules for this Role
+	// +optional
 	Rules []PolicyRule `json:"rules" protobuf:"bytes,2,rep,name=rules"`
 }
 
@@ -170,6 +171,7 @@
 	metav1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
 
 	// Rules holds all the PolicyRules for this ClusterRole
+	// +optional
 	Rules []PolicyRule `json:"rules" protobuf:"bytes,2,rep,name=rules"`
 
 	// AggregationRule is an optional field that describes how to build the Rules for this ClusterRole.
diff --git a/vendor/k8s.io/api/rbac/v1/zz_generated.deepcopy.go b/vendor/k8s.io/api/rbac/v1/zz_generated.deepcopy.go
index 07eb321..095a5e9 100644
--- a/vendor/k8s.io/api/rbac/v1/zz_generated.deepcopy.go
+++ b/vendor/k8s.io/api/rbac/v1/zz_generated.deepcopy.go
@@ -122,7 +122,7 @@
 func (in *ClusterRoleBindingList) DeepCopyInto(out *ClusterRoleBindingList) {
 	*out = *in
 	out.TypeMeta = in.TypeMeta
-	out.ListMeta = in.ListMeta
+	in.ListMeta.DeepCopyInto(&out.ListMeta)
 	if in.Items != nil {
 		in, out := &in.Items, &out.Items
 		*out = make([]ClusterRoleBinding, len(*in))
@@ -155,7 +155,7 @@
 func (in *ClusterRoleList) DeepCopyInto(out *ClusterRoleList) {
 	*out = *in
 	out.TypeMeta = in.TypeMeta
-	out.ListMeta = in.ListMeta
+	in.ListMeta.DeepCopyInto(&out.ListMeta)
 	if in.Items != nil {
 		in, out := &in.Items, &out.Items
 		*out = make([]ClusterRole, len(*in))
@@ -294,7 +294,7 @@
 func (in *RoleBindingList) DeepCopyInto(out *RoleBindingList) {
 	*out = *in
 	out.TypeMeta = in.TypeMeta
-	out.ListMeta = in.ListMeta
+	in.ListMeta.DeepCopyInto(&out.ListMeta)
 	if in.Items != nil {
 		in, out := &in.Items, &out.Items
 		*out = make([]RoleBinding, len(*in))
@@ -327,7 +327,7 @@
 func (in *RoleList) DeepCopyInto(out *RoleList) {
 	*out = *in
 	out.TypeMeta = in.TypeMeta
-	out.ListMeta = in.ListMeta
+	in.ListMeta.DeepCopyInto(&out.ListMeta)
 	if in.Items != nil {
 		in, out := &in.Items, &out.Items
 		*out = make([]Role, len(*in))