Fix sql tests

Author: valepakh

modules/sql-engine/src/integrationTest/java/org/apache/ignite/internal/sql/engine/systemviews/ItComputeSystemViewTest.java

@@ -41,6 +41,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.UUID;
+import java.util.concurrent.CancellationException;
 import java.util.concurrent.CompletableFuture;
 import org.apache.ignite.Ignite;
 import org.apache.ignite.client.IgniteClient;
@@ -277,12 +278,9 @@ public static class InfiniteJob implements ComputeJob<Void, Void> {
                 try {
                     Thread.sleep(500);
                 } catch (InterruptedException e) {
-                    // No op, just return from loop
-                    break;
+                    throw new CancellationException();
                 }
             }
-
-            return null;
         }
     }