[ONOS-7942] Implement k8s ingress service and watcher with unit tests

Change-Id: I8089336916e882bd31b40facf73c46c5ee541718
diff --git a/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/K8sIngressAdminService.java b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/K8sIngressAdminService.java
new file mode 100644
index 0000000..5e2b95b
--- /dev/null
+++ b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/K8sIngressAdminService.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2019-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.k8snetworking.api;
+
+import io.fabric8.kubernetes.api.model.extensions.Ingress;
+
+/**
+ * Service for administering the inventory of kubernetes ingress.
+ */
+public interface K8sIngressAdminService extends K8sIngressService {
+
+    /**
+     * Creates kubernetes ingress with the given information.
+     *
+     * @param ingress the new kubernetes ingress
+     */
+    void createIngress(Ingress ingress);
+
+    /**
+     * Updates the kubernetes ingress with the given information.
+     *
+     * @param ingress the updated kubernetes ingress
+     */
+    void updateIngress(Ingress ingress);
+
+    /**
+     * Removes the kubernetes ingress.
+     *
+     * @param uid kubernetes ingress UID
+     */
+    void removeIngress(String uid);
+
+    /**
+     * Clears the existing ingresses.
+     */
+    void clear();
+}