Fixed circular dependency in slf4j loggers for pulsar-storm unit tests (#264)

pulsar-storm/pom.xml

@@ -79,6 +79,10 @@
       		<groupId>ch.qos.logback</groupId>
       		<artifactId>logback-classic</artifactId>
       	</exclusion>
+      	<exclusion>
+      		<groupId>org.slf4j</groupId>
+      		<artifactId>log4j-over-slf4j</artifactId>
+      	</exclusion>
       </exclusions>
     </dependency>