not needed import

Author: zilm13

services/beaconchain/src/main/java/tech/pegasys/teku/services/beaconchain/BeaconChainController.java

@@ -65,7 +65,6 @@
 import tech.pegasys.teku.infrastructure.async.eventthread.AsyncRunnerEventThread;
 import tech.pegasys.teku.infrastructure.collections.LimitedMap;
 import tech.pegasys.teku.infrastructure.events.EventChannels;
-import tech.pegasys.teku.infrastructure.exceptions.ExceptionUtil;
 import tech.pegasys.teku.infrastructure.exceptions.InvalidConfigurationException;
 import tech.pegasys.teku.infrastructure.io.PortAvailability;
 import tech.pegasys.teku.infrastructure.metrics.SettableGauge;