Use only ConfigFileApplicationListener in server mini-application

In the server we use a SpringApplicationEnvironmentRepository to load
the YAML and properties files from git (or locally). It creates a mini
SpringApplication so as to faithfully replicate the way the Environment
is created. Unfortunately that can have side effects on the server
application itself (e.g. setting log levels). In particular if the
mini SpringApplication fails to start then the log levels could be
left in a "preInitialized" state with all log levels OFF by default.

This change ensures that the server logs all errors when loading YAML
and properties files, and also that the client logs the error response
if it is JSON (as it should be).

Fixes gh-66, fixes gh-67

spring-cloud-config-sample/src/test/java/sample/ApplicationTests.java

@@ -30,21 +30,26 @@ public class ApplicationTests {
 	@Value("${local.server.port}")
 	private int port;
 
+	private static ConfigurableApplicationContext server;
+
 	@BeforeClass
 	public static void startConfigServer() throws IOException {
 		String repo = ConfigServerTestUtils.prepareLocalRepo();
-		ConfigurableApplicationContext context = SpringApplication.run(
+		server = SpringApplication.run(
 				org.springframework.cloud.config.server.ConfigServerApplication.class,
 				"--server.port=" + configPort, "--spring.config.name=server",
 				"--spring.cloud.config.server.git.uri=" + repo);
-		configPort = ((EmbeddedWebApplicationContext) context)
+		configPort = ((EmbeddedWebApplicationContext) server)
 				.getEmbeddedServletContainer().getPort();
 		System.setProperty("config.port", "" + configPort);
 	}
 	
 	@AfterClass
 	public static void close() {
-		System.clearProperty("config.port");		
+		System.clearProperty("config.port");
+		if (server!=null) {
+			server.close();
+		}
 	}
 
 	@Test