fix compile

Author: wernerdv

modules/core/src/test/java/org/apache/ignite/internal/processors/cache/transactions/TxRollbackAsyncTest.java

@@ -86,7 +86,6 @@
 import org.junit.Test;
 
 import static java.lang.Thread.interrupted;
-import static java.lang.Thread.yield;
 import static org.apache.ignite.cache.CacheAtomicityMode.TRANSACTIONAL;
 import static org.apache.ignite.cache.CacheWriteSynchronizationMode.FULL_SYNC;
 import static org.apache.ignite.configuration.WALMode.LOG_ONLY;
@@ -745,7 +744,7 @@ public void testMixedAsyncRollbackTypes() throws Exception {
 
                 // Reserve node for rollback.
                 if (!idx.compareAndSet(nodeId, 0, 1)) {
-                    yield();
+                    Thread.yield();
 
                     continue;
                 }

modules/core/src/test/java/org/apache/ignite/internal/processors/cache/transactions/TxRollbackOnTopologyChangeTest.java

@@ -36,7 +36,6 @@
 import org.apache.ignite.transactions.Transaction;
 import org.junit.Test;
 
-import static java.lang.Thread.yield;
 import static org.apache.ignite.cache.CacheAtomicityMode.TRANSACTIONAL;
 import static org.apache.ignite.cache.CacheWriteSynchronizationMode.FULL_SYNC;
 import static org.apache.ignite.transactions.TransactionConcurrency.PESSIMISTIC;
@@ -173,7 +172,7 @@ public void testRollbackOnTopologyChange() throws Exception {
                     final int nodeId = r.nextInt(TOTAL_CNT);
 
                     if (!reservedIdx.compareAndSet(nodeId, 0, 1)) {
-                        yield();
+                        Thread.yield();
 
                         continue;
                     }