Move BigMGetTests out of the main

Even it isn't harmful, the one useless class in the `.file.test` package looks confusing.

Move it out to the `test` scope and change the dependant projects respectively.

spring-integration-file/src/main/java/org/springframework/integration/file/test/BigMGetTests.java

@@ -1,64 +0,0 @@
-/*
- * 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.file.test;
-
-import java.io.File;
-import java.io.FileOutputStream;
-import java.util.List;
-
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.messaging.Message;
-import org.springframework.messaging.MessageChannel;
-import org.springframework.messaging.PollableChannel;
-import org.springframework.messaging.support.GenericMessage;
-
-/**
- * Created this test because a customer reported hanging with large mget.
- *
- * Could not reproduce; code is checked in, but test is @Ignored.
- * @author Gary Russell
- * @since 2.2
- *
- */
-public abstract class BigMGetTests {
-
-	protected static final int FILES = 600;
-
-	@Autowired
-	private MessageChannel inbound;
-
-	@Autowired
-	private PollableChannel resultChannel;
-
-	protected Message<List<File>> mgetManyFiles() throws Exception {
-		byte[] buff = new byte[150];
-		for (int i = 0; i < FILES; i++) {
-			File f = new File("/tmp/bigmget/file" + i);
-			f.createNewFile();
-			FileOutputStream fos = new FileOutputStream(f);//NOSONAR
-			fos.write(buff);
-			fos.close();
-		}
-		inbound.send(new GenericMessage<String>("/tmp/bigmget/f*"));
-		for (int i = 0; i < FILES; i++) {
-			new File("/tmp/bigmget/file" + i).delete();
-			new File("/tmp/out/file" + i).delete();
-		}
-		@SuppressWarnings("unchecked")
-		Message<List<File>> results = (Message<List<File>>) resultChannel.receive(600000);
-		return results;
-	}
-}

spring-integration-file/src/main/java/org/springframework/integration/file/test/package-info.java

@@ -1,5 +0,0 @@
-/**
- * Provides classes used to support common test cases in modules
- * that are dependent on the file module.
- */
-package org.springframework.integration.file.test;