Use new complex nullable types from norman

Opt into new field types in norman that will convert arrays and maps to
pointers in the generated client code. The generated client code
includes "omitempty" JSON tags, which means that unset and empty values
are both sent to the server as unset, which breaks the cluster create
validation. With this change, there's now a difference between a nil
value and an empty allocated object in the client code.

pkg/apis/gke.cattle.io/v1/types.go

@@ -37,7 +37,7 @@ type GKEClusterConfigSpec struct {
 	Zone                           string                             `json:"zone" norman:"noupdate"`
 	Imported                       bool                               `json:"imported" norman:"noupdate"`
 	Description                    string                             `json:"description"`
-	Labels                         map[string]string                  `json:"labels"`
+	Labels                         map[string]string                  `json:"labels" norman:"type=nullablemap[string]"`
 	EnableKubernetesAlpha          *bool                              `json:"enableKubernetesAlpha"`
 	ClusterAddons                  *GKEClusterAddons                  `json:"clusterAddons"`
 	ClusterIpv4CidrBlock           *string                            `json:"clusterIpv4Cidr" norman:"type=nullablestring"`
@@ -54,7 +54,7 @@ type GKEClusterConfigSpec struct {
 	PrivateClusterConfig           *GKEPrivateClusterConfig           `json:"privateClusterConfig,omitempty"`
 	IPAllocationPolicy             *GKEIPAllocationPolicy             `json:"ipAllocationPolicy,omitempty"`
 	MasterAuthorizedNetworksConfig *GKEMasterAuthorizedNetworksConfig `json:"masterAuthorizedNetworks,omitempty"`
-	Locations                      []string                           `json:"locations"`
+	Locations                      []string                           `json:"locations" norman:"type=nullablearray[string]"`
 	MaintenanceWindow              *string                            `json:"maintenanceWindow,omitempty" norman:"type=nullablestring"`
 }