CORD-352 Refactoring SegmentRoutingConfig

- Add Javadoc and fix function name convention
- Add setAdjancencySids method
- Change return value of getAdjacencySids from List to ImmutableSet
- Validate config value
- Add unit test for SegmentRoutingConfig

Change-Id: Ic43ac31a49da8a9d62131d7803930280cf9994d2
diff --git a/pom.xml b/pom.xml
index 83ae76d..d170a7a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -89,6 +89,11 @@
             <groupId>org.osgi</groupId>
             <artifactId>org.osgi.core</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onlab-junit</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>