Cleanup unused code in Kafka Application and other cosmetic changes[patchset #2]

1. Deleted classes not being used.
2. There was inconsistent terminology in use w.r.t naming of classes for ex - producer vs publisher.

Change-Id: If78a06bb59261bdfe1854ae8ed3ee2218696d984
diff --git a/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/EventMonitor.java b/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/EventListener.java
similarity index 97%
rename from apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/EventMonitor.java
rename to apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/EventListener.java
index 4bc0450..13a24c2 100644
--- a/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/EventMonitor.java
+++ b/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/EventListener.java
@@ -24,7 +24,7 @@
 import org.apache.kafka.clients.producer.ProducerRecord;
 import org.onosproject.kafkaintegration.api.EventConversionService;
 import org.onosproject.kafkaintegration.api.EventSubscriptionService;
-import org.onosproject.kafkaintegration.api.KafkaProducerService;
+import org.onosproject.kafkaintegration.api.KafkaPublisherService;
 import org.onosproject.kafkaintegration.api.KafkaConfigService;
 import org.onosproject.kafkaintegration.api.dto.OnosEvent;
 import org.onosproject.net.device.DeviceEvent;
@@ -49,7 +49,7 @@
  * Encapsulates the behavior of monitoring various ONOS events.
  * */
 @Component(immediate = true)
-public class EventMonitor {
+public class EventListener {
     private final Logger log = LoggerFactory.getLogger(getClass());
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
@@ -59,7 +59,7 @@
     protected EventConversionService eventConversionService;
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected KafkaProducerService kafkaProducer;
+    protected KafkaPublisherService kafkaProducer;
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected DeviceService deviceService;
diff --git a/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/Producer.java b/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/EventPublisher.java
similarity index 95%
rename from apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/Producer.java
rename to apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/EventPublisher.java
index 4267d87..c471312 100644
--- a/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/Producer.java
+++ b/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/EventPublisher.java
@@ -26,7 +26,7 @@
 import org.apache.kafka.clients.producer.KafkaProducer;
 import org.apache.kafka.clients.producer.ProducerRecord;
 import org.apache.kafka.clients.producer.RecordMetadata;
-import org.onosproject.kafkaintegration.api.KafkaProducerService;
+import org.onosproject.kafkaintegration.api.KafkaPublisherService;
 import org.onosproject.kafkaintegration.api.dto.KafkaServerConfig;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -36,7 +36,7 @@
  */
 @Component
 @Service
-public class Producer implements KafkaProducerService {
+public class EventPublisher implements KafkaPublisherService {
     private KafkaProducer<String, byte[]> kafkaProducer = null;
 
     private final Logger log = LoggerFactory.getLogger(getClass());
diff --git a/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/KafkaConfigManager.java b/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/KafkaConfigManager.java
index 35a2207..40d1d2d 100644
--- a/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/KafkaConfigManager.java
+++ b/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/kafka/KafkaConfigManager.java
@@ -30,7 +30,7 @@
 import org.apache.felix.scr.annotations.Service;
 import org.onosproject.cfg.ComponentConfigService;
 import org.onosproject.kafkaintegration.api.KafkaConfigService;
-import org.onosproject.kafkaintegration.api.KafkaProducerService;
+import org.onosproject.kafkaintegration.api.KafkaPublisherService;
 import org.onosproject.kafkaintegration.api.dto.KafkaServerConfig;
 import org.osgi.service.component.ComponentContext;
 import org.slf4j.Logger;
@@ -46,7 +46,7 @@
     protected ComponentConfigService componentConfigService;
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected KafkaProducerService producer;
+    protected KafkaPublisherService producer;
 
     public static final String BOOTSTRAP_SERVERS = "localhost:9092";
     private String kafkaServerIp =