Reverse app names when fetching s3 data (#2652)

This matches the behavior of other EnvironmentRepositories like Git.

#Fixes #2642

Author: ryanjbaxter

spring-cloud-config-server/src/main/java/org/springframework/cloud/config/server/environment/AwsS3EnvironmentRepository.java

@@ -86,6 +86,7 @@ public Environment findOne(String specifiedApplication, String specifiedProfiles
 
 		String[] profileArray = parseProfiles(profiles);
 		List<String> apps = Arrays.asList(StringUtils.commaDelimitedListToStringArray(application.replace(" ", "")));
+		Collections.reverse(apps);
 		if (!apps.contains(serverProperties.getDefaultApplicationName())) {
 			apps = new ArrayList<>(apps);
 			apps.add(serverProperties.getDefaultApplicationName());

spring-cloud-config-server/src/test/java/org/springframework/cloud/config/server/environment/AwsS3EnvironmentRepositoryTests.java

@@ -257,10 +257,12 @@ public void findWithVersion() throws UnsupportedEncodingException {
 
 	@Test
 	public void findWithMultipleApplicationAllFound() throws UnsupportedEncodingException {
-		putFiles("foo-profile1.yml", jsonContent);
-		String versionId = putFiles("bar-profile1.yml", jsonContent);
+		String versionId = putFiles("foo-profile1.yml", jsonContent);
+		putFiles("bar-profile1.yml", jsonContent);
 
 		final Environment env = envRepo.findOne("foo,bar", "profile1", null);
+		assertThat(env.getPropertySources().get(0).getName()).isEqualTo("s3:bar-profile1");
+		assertThat(env.getPropertySources().get(1).getName()).isEqualTo("s3:foo-profile1");
 
 		assertExpectedEnvironment(env, "foo,bar", null, versionId, 2, "profile1");