Fix javadoc generation not working with JDK 11

By updating the maven-javadoc-plugin in onos-dependencies.

Change-Id: I2e27bcd65e7407606b6f7faf12311133c365b6f3
diff --git a/pom.xml b/pom.xml
index 523fd0b..8383b84 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <groupId>org.onosproject</groupId>
         <artifactId>onos-dependencies</artifactId>
-        <version>2.2.1-b2</version>
+        <version>2.2.1-b3</version>
     </parent>
 
     <groupId>org.opencord</groupId>
diff --git a/src/main/java/org/opencord/cordmcast/CordMcast.java b/src/main/java/org/opencord/cordmcast/CordMcast.java
index cd3f3bb..ad3f2a7 100644
--- a/src/main/java/org/opencord/cordmcast/CordMcast.java
+++ b/src/main/java/org/opencord/cordmcast/CordMcast.java
@@ -52,7 +52,6 @@
 import org.onosproject.net.device.DeviceService;
 import org.onosproject.net.flow.DefaultTrafficSelector;
 import org.onosproject.net.flow.DefaultTrafficTreatment;
-import org.onosproject.net.flow.FlowRuleService;
 import org.onosproject.net.flow.TrafficSelector;
 import org.onosproject.net.flowobjective.DefaultForwardingObjective;
 import org.onosproject.net.flowobjective.DefaultNextObjective;