Use pinned dispatcher for kafka consumer in order to have one thread

per consumer

* This should reduce latency for cases where a lot of kafka consumers are
  running and could potentially block the thread to long for other consumers

Signed-off-by: Yannic Klem <yannic.klem@bosch.io>

connectivity/service/src/main/resources/connectivity.conf

@@ -844,14 +844,8 @@ http-push-connection-dispatcher {
 }
 
 kafka-consumer-dispatcher {
-  type = "Dispatcher"
+  type = PinnedDispatcher
   executor = "thread-pool-executor"
-  thread-pool-executor {
-    keep-alive-time = 60s
-    fixed-pool-size = off
-    max-pool-size-max = 256
-    max-pool-size-max = ${?KAFKA_CONNECTION_DISPATCHER_POOL_SIZE_MAX}
-  }
 }
 
 kafka-producer-dispatcher {