Add kubevirt API config service, expose it via REST API and CLI

Change-Id: I45a867ad54622656475758e7b4af38c19e551790
diff --git a/apps/kubevirt-node/api/src/main/java/org/onosproject/kubevirtnode/api/KubevirtApiConfigStore.java b/apps/kubevirt-node/api/src/main/java/org/onosproject/kubevirtnode/api/KubevirtApiConfigStore.java
new file mode 100644
index 0000000..63e7caf
--- /dev/null
+++ b/apps/kubevirt-node/api/src/main/java/org/onosproject/kubevirtnode/api/KubevirtApiConfigStore.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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.
+ */
+package org.onosproject.kubevirtnode.api;
+
+import org.onosproject.store.Store;
+
+import java.util.Set;
+
+/**
+ * Manages inventory of KubeVirt API config; not intended for direct use.
+ */
+public interface KubevirtApiConfigStore
+        extends Store<KubevirtApiConfigEvent, KubevirtApiConfigStoreDelegate> {
+
+    /**
+     * Creates a API config.
+     *
+     * @param config KubeVirt API server config
+     */
+    void createApiConfig(KubevirtApiConfig config);
+
+    /**
+     * Updates the API config.
+     *
+     * @param config KubeVirt API server config
+     */
+    void updateApiConfig(KubevirtApiConfig config);
+
+    /**
+     * Removes the KubeVirt API config with the given endpoint.
+     * Endpoint comprises of scheme (HTTP), IP address and port
+     *
+     * @param endpoint KubeVirt API endpoint
+     * @return removed KubeVirt API server config; null if no config
+     *         associated with the endpoint
+     */
+    KubevirtApiConfig removeApiConfig(String endpoint);
+
+    /**
+     * Returns all registered KubeVirt API configs.
+     *
+     * @return set of KubeVirt API configs
+     */
+    Set<KubevirtApiConfig> apiConfigs();
+
+    /**
+     * Returns the API config.
+     *
+     * @param endpoint endpoint
+     * @return KubeVirt API config
+     */
+    KubevirtApiConfig apiConfig(String endpoint);
+}