Kafka passwords are written to the logs
When using smallrye-reactive-messaging with the Kafka connector, the connector merge the config and log this merged config.
It output the password in the logs, this is a security issue.

See this sample log file from a Quarkus application

```
2020-09-22 11:12:12,230 INFO  [io.sma.rea.mes.kafka] (Quarkus Main Thread) SRMSG18200: Merging config with {security.protocol=SSL, ssl.keystore.type=PKCS12, ssl.truststore.location=truststore.jks, ssl.keystore.password=secret, ssl.key.password=secret, ssl.keystore.location=keystore.p12, bootstrap.servers=my-host:9092, ssl.truststore.password=secret}
```
diff --git a/smallrye-reactive-messaging-kafka/src/main/java/io/smallrye/reactive/messaging/kafka/KafkaConnector.java b/smallrye-reactive-messaging-kafka/src/main/java/io/smallrye/reactive/messaging/kafka/KafkaConnector.java
index 7eefe4765..2f90b64af 100644
--- a/smallrye-reactive-messaging-kafka/src/main/java/io/smallrye/reactive/messaging/kafka/KafkaConnector.java
+++ b/smallrye-reactive-messaging-kafka/src/main/java/io/smallrye/reactive/messaging/kafka/KafkaConnector.java
@@ -183,8 +183,6 @@ public class KafkaConnector implements IncomingConnectorFactory, OutgoingConnect
     }
 
     private Config merge(Config passedCfg, Map<String, Object> defaultKafkaCfg) {
-        log.mergingConfigWith(defaultKafkaCfg);
-
         return new Config() {
             @SuppressWarnings("unchecked")
             @Override
diff --git a/smallrye-reactive-messaging-kafka/src/main/java/io/smallrye/reactive/messaging/kafka/i18n/KafkaLogging.java b/smallrye-reactive-messaging-kafka/src/main/java/io/smallrye/reactive/messaging/kafka/i18n/KafkaLogging.java
index b15e52495..177f7b1bb 100644
--- a/smallrye-reactive-messaging-kafka/src/main/java/io/smallrye/reactive/messaging/kafka/i18n/KafkaLogging.java
+++ b/smallrye-reactive-messaging-kafka/src/main/java/io/smallrye/reactive/messaging/kafka/i18n/KafkaLogging.java
@@ -1,6 +1,5 @@
 package io.smallrye.reactive.messaging.kafka.i18n;
 
-import java.util.Map;
 import java.util.Set;
 
 import org.jboss.logging.BasicLogger;
@@ -19,10 +18,6 @@ public interface KafkaLogging extends BasicLogger {
 
     KafkaLogging log = Logger.getMessageLogger(KafkaLogging.class, "io.smallrye.reactive.messaging.kafka");
 
-    @LogMessage(level = Logger.Level.INFO)
-    @Message(id = 18200, value = "Merging config with %s")
-    void mergingConfigWith(Map<String, Object> defaultKafkaCfg);
-
     @LogMessage(level = Logger.Level.DEBUG)
     @Message(id = 18201, value = "Dead queue letter configured with: topic: `%s`, key serializer: `%s`, value serializer: `%s`")
     void deadLetterConfig(String deadQueueTopic, String keySerializer, String valueSerializer);
['smallrye-reactive-messaging-kafka/src/main/java/io/smallrye/reactive/messaging/kafka/i18n/KafkaLogging.java', 'smallrye-reactive-messaging-kafka/src/main/java/io/smallrye/reactive/messaging/kafka/KafkaConnector.java']