[ONOS-3702] Clean up pom.xml dependency, bump up omitted dependency

Change-Id: Ieb6dc7a5b3ee8d52eefd79c182b9d759b5d324d7
diff --git a/protocols/openflow/api/pom.xml b/protocols/openflow/api/pom.xml
index 9f809c8..ef41b40 100644
--- a/protocols/openflow/api/pom.xml
+++ b/protocols/openflow/api/pom.xml
@@ -54,7 +54,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
-                <version>2.3</version>
+                <version>2.4.2</version>
                 <configuration>
                     <artifactSet>
                         <excludes>