INT-2652 Fix mget for FTP

FTP servers return full path from listNames() whereas SFTP
returns just the filename. mget logic assumed SFTP behavior.

Add a test to see if the filename already starts with the remote
directory and remove it before calling get() (which assumes just
the filename).

Includes an @Ignored test for FTP and SFTP that runs an mget
against a server.

spring-integration-ftp/src/test/java/org/springframework/integration/ftp/outbound/BigMGetTests-context.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:int-ftp="http://www.springframework.org/schema/integration/ftp"
+	xmlns:int="http://www.springframework.org/schema/integration"
+	xsi:schemaLocation="http://www.springframework.org/schema/integration/ftp http://www.springframework.org/schema/integration/ftp/spring-integration-ftp.xsd
+		http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
+		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+
+	<bean id="ftpSessionFactory"
+		class="org.springframework.integration.ftp.session.DefaultFtpSessionFactory">
+		<property name="host" value="localhost"/>
+		<property name="username" value="ftptest"/>
+		<property name="password" value="ftptest"/>
+	</bean>
+
+	<int:channel id="inbound" />
+
+	<int-ftp:outbound-gateway id="gatewayLS" cache-sessions="false"
+		session-factory="ftpSessionFactory"
+		request-channel="inbound"
+		command="mget"
+		command-options=""
+		expression="payload"
+		local-directory="/tmp/out"
+		reply-channel="resultChannel"/>
+
+	<int:channel id="resultChannel">
+		<int:queue />
+	</int:channel>
+</beans>

spring-integration-ftp/src/test/java/org/springframework/integration/ftp/outbound/BigMGetTests.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2002-2012 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.ftp.outbound;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+/**
+ * @author Gary Russell
+ * @since 2.2
+ *
+ */
+@ContextConfiguration
+@RunWith(SpringJUnit4ClassRunner.class)
+public class BigMGetTests extends org.springframework.integration.file.test.BigMGetTests {
+
+	@Test @Ignore // needs directories and server (FTP and SFTP)
+	public void doTest() throws Exception {
+		assertEquals(FILES, this.mgetManyFiles().getPayload().size());
+	}
+}