ONOS-6886 Move interface classes from incubator to core

Change-Id: Iaae4d98279e4b77fc3f0b5a63d547921f93aeb46
diff --git a/core/api/src/main/java/org/onosproject/net/intf/InterfaceAdminService.java b/core/api/src/main/java/org/onosproject/net/intf/InterfaceAdminService.java
new file mode 100644
index 0000000..c276c96
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/intf/InterfaceAdminService.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2015-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.net.intf;
+
+import org.onosproject.net.ConnectPoint;
+
+/**
+ * Provides a means to modify the interfaces configuration.
+ */
+public interface InterfaceAdminService {
+
+    /**
+     * Adds a new interface configuration to the system.
+     *
+     * @param intf interface to add
+     */
+    void add(Interface intf);
+
+    /**
+     * Removes an interface configuration from the system.
+     *
+     * @param connectPoint connect point of the interface
+     * @param name name of the interface
+     * @return the result of removal
+     */
+    boolean remove(ConnectPoint connectPoint, String name);
+}