Unit test coverage for domainmodel-lib classes

Unit test Coverage for:
1.Vnf.java
2.Vnfc.java
3.Vserver.java

Sonar Link:
https://sonar.onap.org/code?id=org.onap.appc%3Aappc&selected=org.onap.appc%3Aappc-dg-domain-model-lib%3Asrc%2Fmain%2Fjava%2Forg%2Fonap%2Fappc%2Fdomainmodel

Change-Id: I7a77a992a1957020a066bcd5676c9a63cc7cd328
Issue-ID: APPC-720
Signed-off-by: shubhada <SV00449682@techmahindra.com>
diff --git a/appc-dg/appc-dg-shared/appc-dg-domain-model-lib/pom.xml b/appc-dg/appc-dg-shared/appc-dg-domain-model-lib/pom.xml
index 66eecb0..ca324e9 100644
--- a/appc-dg/appc-dg-shared/appc-dg-domain-model-lib/pom.xml
+++ b/appc-dg/appc-dg-shared/appc-dg-domain-model-lib/pom.xml
@@ -46,5 +46,11 @@
       <version>3.8.1</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+    </dependency>
   </dependencies>
 </project>