AMBARI-15457. Topology host info is not cleared when a host is removed (ajit)

ambari-server/src/test/java/org/apache/ambari/server/controller/internal/HostResourceProviderTest.java

@@ -74,6 +74,7 @@ import org.apache.ambari.server.state.HostConfig;
 import org.apache.ambari.server.state.HostHealthStatus;
 import org.apache.ambari.server.state.HostHealthStatus.HealthStatus;
 import org.apache.ambari.server.state.MaintenanceState;
+import org.apache.ambari.server.state.ServiceComponentHost;
 import org.apache.ambari.server.state.stack.OsFamily;
 import org.apache.ambari.server.topology.TopologyManager;
 import org.easymock.EasyMock;