use group.id for unique key kafka consumer

Author: Robert Diers

src/main/java/org/opentesting/services/adapter/kafka/OpenTestingKafkaConsumer.java

@@ -44,7 +44,8 @@ public class OpenTestingKafkaConsumer {
     @LogExecutionTime
     public void createConsumer(TestCaseServiceDTO service, Adapter adapter) {
 
-        String key = service.getConnectstring()+"#"+service.getCustom("topic").getValue()+"#"+service.getUsername();
+        //shared between test cases
+        String key = service.getConnectstring()+"#"+service.getCustom("topic").getValue()+"#"+service.getUsername()+"#"+service.getCustom("group.id").getValue();
         if (createdConsumers.containsKey(key)) {
             log.info("kafka consumer already exists: "+key);
             return;