Make sure watcher is started before running the test.

Original commit: elastic/x-pack-elasticsearch@c1d081fd10

src/test/java/org/elasticsearch/watcher/execution/ManualExecutionTests.java

@@ -40,6 +40,7 @@ public class ManualExecutionTests extends AbstractWatcherIntegrationTests {
     @Test
     @Repeat(iterations = 10)
     public void testExecuteWatch() throws Exception {
+        ensureWatcherStarted();
         boolean ignoreCondition = randomBoolean();
         boolean persistRecord = randomBoolean();
         boolean conditionAlwaysTrue = randomBoolean();