Move interface config classes out of incubator to core net

Change-Id: I4cbc384e9bbfda00850b98541e63c4dd70f3627b
diff --git a/core/api/src/main/java/org/onosproject/net/config/ConfigException.java b/core/api/src/main/java/org/onosproject/net/config/ConfigException.java
new file mode 100644
index 0000000..cafce7e
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/config/ConfigException.java
@@ -0,0 +1,46 @@
+/*
+ * 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.config;
+
+import com.google.common.annotations.Beta;
+
+/**
+ * Signals that an error was encountered while reading/writing configuration.
+ */
+
+@Beta
+public class ConfigException extends Exception {
+
+    /**
+     * Constructs a new ConfigException with the given message.
+     *
+     * @param message message
+     */
+    public ConfigException(String message) {
+        super(message);
+    }
+
+    /**
+     * Constructs a new ConfigException with the given message and cause.
+     *
+     * @param message message
+     * @param cause cause
+     */
+    public ConfigException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}