[ONOS-5096][ONOS-5104] Checkstyle issues fixed for generated code.

Change-Id: I6a0984c2b397dbeda912e75138d5ad9e7adf33d5
diff --git a/plugin/pom.xml b/plugin/pom.xml
index 13eed0c..ee692f2 100644
--- a/plugin/pom.xml
+++ b/plugin/pom.xml
@@ -115,6 +115,12 @@
             <artifactId>build-helper-maven-plugin</artifactId>
             <version>1.10</version>
         </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>1.7.21</version>
+            <scope>provided</scope>
+        </dependency>
     </dependencies>
 
     <build>