Helix exceptions when running integration tests

Looks like this is happening after we added leadControllerResource. Lets clean up other Helix exceptions as well when we look into this.

```2019/06/22 09:05:16.928 WARN [BestPossibleStateCalcStage] [HelixController-pipeline-default-OfflineClusterIntegrationTest] Event aaadf5d1_DEFAULT : Failed to calculate best possible states for leadControllerResource
2019/06/22 09:05:16.929 WARN [BestPossibleStateCalcStage] [HelixController-async_tasks-OfflineClusterIntegrationTest] Event aaadf5d1_DEFAULT : Failed to calculate best possible states for 1 resources.
2019/06/22 09:05:21.954 WARN [AutoRebalancer] [HelixController-pipeline-default-OfflineClusterIntegrationTest] Resource leadControllerResource has tag controller but no configured participants have this tag
2019/06/22 09:05:21.954 ERROR [CRUSHPlacementAlgorithm] [HelixController-pipeline-default-OfflineClusterIntegrationTest] 1 nodes of type INSTANCE were requested but the tree has only 0 nodes!
2019/06/22 09:05:21.955 ERROR [BestPossibleStateCalcStage] [HelixController-pipeline-default-OfflineClusterIntegrationTest] Event 512cdf47_DEFAULT : Error computing assignment for resource leadControllerResource. Skipping.
java.lang.IllegalStateException: null
at org.apache.helix.controller.rebalancer.strategy.crushMapping.CRUSHPlacementAlgorithm$Selector.select(CRUSHPlacementAlgorithm.java:308) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.rebalancer.strategy.crushMapping.CRUSHPlacementAlgorithm.select(CRUSHPlacementAlgorithm.java:119) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.rebalancer.strategy.CrushRebalanceStrategy.doSelect(CrushRebalanceStrategy.java:174) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.rebalancer.strategy.CrushRebalanceStrategy.select(CrushRebalanceStrategy.java:140) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.rebalancer.strategy.CrushRebalanceStrategy.computePartitionAssignment(CrushRebalanceStrategy.java:92) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.rebalancer.strategy.CrushRebalanceStrategy.computePartitionAssignment(CrushRebalanceStrategy.java:48) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.rebalancer.strategy.AbstractEvenDistributionRebalanceStrategy.computePartitionAssignment(AbstractEvenDistributionRebalanceStrategy.java:89) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.rebalancer.strategy.AbstractEvenDistributionRebalanceStrategy.computePartitionAssignment(AbstractEvenDistributionRebalanceStrategy.java:49) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.rebalancer.AutoRebalancer.computeNewIdealState(AutoRebalancer.java:129) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.rebalancer.AutoRebalancer.computeNewIdealState(AutoRebalancer.java:51) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.stages.BestPossibleStateCalcStage.computeResourceBestPossibleState(BestPossibleStateCalcStage.java:245) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.stages.BestPossibleStateCalcStage.compute(BestPossibleStateCalcStage.java:121) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.stages.BestPossibleStateCalcStage.process(BestPossibleStateCalcStage.java:77) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.pipeline.Pipeline.handle(Pipeline.java:68) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.GenericHelixController.handleEvent(GenericHelixController.java:640) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.GenericHelixController.access$400(GenericHelixController.java:117) ~[helix-core-0.9.0.jar:0.9.0]
at org.apache.helix.controller.GenericHelixController$ClusterEventProcessor.run(GenericHelixController.java:1168) ~[helix-core-0.9.0.jar:0.9.0]
```