Don't automatically log auto-configuration report

Update the `AutoConfigurationReportLoggingInitializer` to only output
the report at debug level. A crash report now triggers an info output
suggesting the user runs again with '--debug' to display the report.

Fixes gh-199

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/AutoConfigurationReportLoggingInitializer.java

@@ -106,7 +106,8 @@ public class AutoConfigurationReportLoggingInitializer implements
 	public void logAutoConfigurationReport(boolean isCrashReport) {
 		if (this.report == null) {
 			if (this.applicationContext == null) {
-				this.logger.info("Nothing to report: ApplicationContext not available");
+				this.logger.info("Unable to provide auto-configuration report "
+						+ "due to missing ApplicationContext");
 				return;
 			}
 			this.report = AutoConfigurationReport.get(this.applicationContext
@@ -114,10 +115,11 @@ public class AutoConfigurationReportLoggingInitializer implements
 		}
 		if (this.report.getConditionAndOutcomesBySource().size() > 0) {
 			if (isCrashReport && this.logger.isInfoEnabled()) {
-				this.logger.info(getLogMessage(this.report
-						.getConditionAndOutcomesBySource()));
+				this.logger.info("\n\nError starting ApplicationContext. "
+						+ "To display the auto-configuration report enabled "
+						+ "debug logging (start with --debug)\n\n");
 			}
-			else if (!isCrashReport && this.logger.isDebugEnabled()) {
+			if (this.logger.isDebugEnabled()) {
 				this.logger.debug(getLogMessage(this.report
 						.getConditionAndOutcomesBySource()));
 			}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/AutoConfigurationReportLoggingInitializerTests.java

@@ -115,7 +115,7 @@ public class AutoConfigurationReportLoggingInitializerTests {
 	}
 
 	@Test
-	public void logsInfoOnError() {
+	public void logsInfoAndDebugOnError() {
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
 		this.initializer.initialize(context);
 		context.register(ErrorConfig.class);
@@ -128,7 +128,7 @@ public class AutoConfigurationReportLoggingInitializerTests {
 					new SpringApplication(), context, new String[] {}, ex));
 		}
 
-		assertThat(this.debugLog.size(), equalTo(0));
+		assertThat(this.debugLog.size(), not(equalTo(0)));
 		assertThat(this.infoLog.size(), not(equalTo(0)));
 	}
 
@@ -171,7 +171,8 @@ public class AutoConfigurationReportLoggingInitializerTests {
 		this.initializer.onApplicationEvent(new SpringApplicationErrorEvent(
 				new SpringApplication(), null, new String[0], new RuntimeException(
 						"Planned")));
-		assertThat(this.infoLog.get(0), containsString("Nothing to report"));
+		assertThat(this.infoLog.get(0),
+				containsString("Unable to provide auto-configuration report"));
 	}
 
 	public static class MockLogFactory extends LogFactoryImpl {