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/pom.xml b/pom.xml
index f2338f8..fa6e068 100644
--- a/pom.xml
+++ b/pom.xml
@@ -108,6 +108,11 @@
             <version>${project.version}</version>
         </dependency>
         <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-cord-config</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
             <groupId>com.jcraft</groupId>
             <artifactId>jsch</artifactId>
             <version>0.1.53</version>