[CORD-313] Handles uncaught exceptions when device is not configured

Includes following minor changes
    - Move DeviceConfiguration and DeviceProperties to config package
    - Create DeviceConfigNotFoundException

Change-Id: I32455d88c712bb65cd7f71dab9472ae003303de2
diff --git a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/config/DeviceConfigNotFoundException.java b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/config/DeviceConfigNotFoundException.java
new file mode 100644
index 0000000..ae156e6
--- /dev/null
+++ b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/config/DeviceConfigNotFoundException.java
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2014-2015 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.segmentrouting.config;
+
+/**
+ * Signals that an error occurred during reading device configuration.
+ */
+public class DeviceConfigNotFoundException extends Exception {
+
+    /**
+     * Creates a new ConfigNotFoundException with the given message.
+     *
+     * @param message exception message
+     */
+    public DeviceConfigNotFoundException(String message) {
+        super(message);
+    }
+}