Fix review comments and new changes in config (#8515)

- Migrate and save only settings which are enabled
- Rename logger_http to logger_webhook and
  logger_http_audit to audit_webhook
- No more pretty printing comments, comment
  is a key=value pair now.
- Avoid quotes on values which do not have space in them
- `state="on"` is implicit for all SetConfigKV unless
  specified explicitly as `state="off"`
- Disabled IAM users should be disabled always

pkg/event/target/kafka.go

@@ -39,10 +39,10 @@ const (
 	KafkaTopic         = "topic"
 	KafkaQueueDir      = "queue_dir"
 	KafkaQueueLimit    = "queue_limit"
-	KafkaTLSEnable     = "tls_enable"
+	KafkaTLS           = "tls"
 	KafkaTLSSkipVerify = "tls_skip_verify"
 	KafkaTLSClientAuth = "tls_client_auth"
-	KafkaSASLEnable    = "sasl_enable"
+	KafkaSASL          = "sasl"
 	KafkaSASLUsername  = "sasl_username"
 	KafkaSASLPassword  = "sasl_password"
 
@@ -51,10 +51,10 @@ const (
 	EnvKafkaTopic         = "MINIO_NOTIFY_KAFKA_TOPIC"
 	EnvKafkaQueueDir      = "MINIO_NOTIFY_KAFKA_QUEUE_DIR"
 	EnvKafkaQueueLimit    = "MINIO_NOTIFY_KAFKA_QUEUE_LIMIT"
-	EnvKafkaTLSEnable     = "MINIO_NOTIFY_KAFKA_TLS_ENABLE"
+	EnvKafkaTLS           = "MINIO_NOTIFY_KAFKA_TLS"
 	EnvKafkaTLSSkipVerify = "MINIO_NOTIFY_KAFKA_TLS_SKIP_VERIFY"
 	EnvKafkaTLSClientAuth = "MINIO_NOTIFY_KAFKA_TLS_CLIENT_AUTH"
-	EnvKafkaSASLEnable    = "MINIO_NOTIFY_KAFKA_SASL_ENABLE"
+	EnvKafkaSASLEnable    = "MINIO_NOTIFY_KAFKA_SASL"
 	EnvKafkaSASLUsername  = "MINIO_NOTIFY_KAFKA_SASL_USERNAME"
 	EnvKafkaSASLPassword  = "MINIO_NOTIFY_KAFKA_SASL_PASSWORD"
 )