Add aro_hcp v1alpha1 Cluster type

model/aro_hcp/v1_alpha1/root_resource.model

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+/*
+Copyright (c) 2019 Red Hat, Inc.
+
+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.
+*/
+
+// Root of the tree of resources of the clusters management service.
+resource Root {
+	// Reference to the resource that manages the collection of clusters.
+	@ref(path = "/clusters_mgmt/v1/clusters")
+	locator Clusters {
+		target Clusters
+	}
+}