[ONOS-5757]&[ONOS-5758] add Restconf GET, POST and DELETE
operates to RestconfManager.java

Change-Id: I4edf183676b7d4fdf94f1f2c7da8c88891b9785b
diff --git a/apps/restconf/utils/src/main/java/org/onosproject/restconf/utils/exceptions/RestconfUtilsException.java b/apps/restconf/utils/src/main/java/org/onosproject/restconf/utils/exceptions/RestconfUtilsException.java
new file mode 100644
index 0000000..c8d0791
--- /dev/null
+++ b/apps/restconf/utils/src/main/java/org/onosproject/restconf/utils/exceptions/RestconfUtilsException.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2017-present Open Networking Laboratory
+ *
+ * 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.restconf.utils.exceptions;
+
+/**
+ * Represents class of errors related to RESTCONF utilities.
+ */
+public class RestconfUtilsException extends RuntimeException {
+
+    /**
+     * Constructs an exception with the specified message.
+     *
+     * @param message the message describing the specific nature of the error
+     */
+    public RestconfUtilsException(String message) {
+        super(message);
+    }
+
+    /**
+     * Constructs an exception with the specified message and the underlying
+     * cause.
+     *
+     * @param message the message describing the specific nature of the error
+     * @param cause   the underlying cause of this error
+     */
+    public RestconfUtilsException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}