Refactored to handle service instance by service type

- Added service instance handler
- Implemented dummy, vsg, and olt agent instance handler

Change-Id: Id3edd5eecb1caadf0f835cb10a952100e18b283b
diff --git a/src/main/java/org/onosproject/cordvtn/impl/service/package-info.java b/src/main/java/org/onosproject/cordvtn/impl/service/package-info.java
new file mode 100644
index 0000000..035b012
--- /dev/null
+++ b/src/main/java/org/onosproject/cordvtn/impl/service/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-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.
+ */
+
+/**
+ * Implementation of instance handlers for various network services.
+ */
+package org.onosproject.cordvtn.impl.service;
\ No newline at end of file