INT-3786: Fix Several Sporadic Test Failures

JIRA: https://jira.spring.io/browse/INT-3786

* Increase `receiveTimeout` for several `QueueChannel` and `CountDownLatch` based tests
* Fix `FileSplitterTests` for Windows compatibility - `UTF-8` for bytes conversion
* Make some STOMP tests as `LongRunning`

The next fixing phase

spring-integration-test/src/main/java/org/springframework/integration/test/util/OnlyOnceTrigger.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright 2002-2015 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+package org.springframework.integration.test.util;
+
+import java.util.Date;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import org.springframework.scheduling.Trigger;
+import org.springframework.scheduling.TriggerContext;
+
+/**
+ *
+ * @author Gunnar Hillert
+ * @since 2.2
+ *
+ */
+public class OnlyOnceTrigger implements Trigger {
+
+	private static final AtomicBoolean hasRun = new AtomicBoolean();
+
+	private final Date executionTime;
+
+	private static volatile CountDownLatch latch = new CountDownLatch(1);
+
+
+	public OnlyOnceTrigger() {
+		super();
+		executionTime = new Date();
+	}
+
+	public Date nextExecutionTime(TriggerContext triggerContext) {
+
+		if (OnlyOnceTrigger.hasRun.getAndSet(true)) {
+			OnlyOnceTrigger.latch.countDown();
+			return null;
+		}
+
+		return this.executionTime;
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result
+				+ ((executionTime == null) ? 0 : executionTime.hashCode());
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj)
+			return true;
+		if (obj == null)
+			return false;
+		if (getClass() != obj.getClass())
+			return false;
+		OnlyOnceTrigger other = (OnlyOnceTrigger) obj;
+		if (executionTime == null) {
+			if (other.executionTime != null)
+				return false;
+		} else if (!executionTime.equals(other.executionTime))
+			return false;
+		return true;
+	}
+
+	public void reset() {
+		OnlyOnceTrigger.latch = new CountDownLatch(1);
+		OnlyOnceTrigger.hasRun.set(false);
+	}
+
+	public void await() {
+		try {
+			OnlyOnceTrigger.latch.await(5000, TimeUnit.MILLISECONDS);
+			if (latch.getCount() != 0) {
+				throw new RuntimeException("test latch.await() did not count down");
+			}
+		}
+		catch (InterruptedException e) {
+			throw new RuntimeException("test latch.await() interrupted");
+		}
+	}
+
+}