Be smarter about the ConfigClientProperties and parent context

In case there is a parent context we can re-use the bean from that
if it exists, instead of always creating it and risking the values
being different.

spring-cloud-config-client/src/main/java/org/springframework/cloud/autoconfigure/ConfigClientAutoConfiguration.java

@@ -15,7 +15,9 @@
  */
 package org.springframework.cloud.autoconfigure;
 
+import org.springframework.beans.factory.BeanFactoryUtils;
 import org.springframework.cloud.config.client.ConfigClientProperties;
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.env.Environment;
@@ -33,7 +35,12 @@ import org.springframework.core.env.Environment;
 public class ConfigClientAutoConfiguration {
 
 	@Bean
-	public ConfigClientProperties configClientProperties(Environment environment) {
+	public ConfigClientProperties configClientProperties(Environment environment,
+			ApplicationContext context) {
+		if (context.getParent()!=null && BeanFactoryUtils.beanNamesForTypeIncludingAncestors(context.getParent(),
+				ConfigClientProperties.class).length > 0) {
+			return BeanFactoryUtils.beanOfType(context.getParent(), ConfigClientProperties.class);
+		}
 		ConfigClientProperties client = new ConfigClientProperties(environment);
 		return client;
 	}

spring-cloud-config-client/src/test/java/org/springframework/cloud/autoconfigure/ConfigClientAutoConfigurationTests.java

@@ -0,0 +1,32 @@
+package org.springframework.cloud.autoconfigure;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+import org.springframework.beans.factory.BeanFactoryUtils;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.cloud.config.client.ConfigClientProperties;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+public class ConfigClientAutoConfigurationTests {
+
+	@Test
+	public void sunnyDay() {
+		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
+				ConfigClientAutoConfiguration.class);
+		assertEquals(1, BeanFactoryUtils.beanNamesForTypeIncludingAncestors(context,
+				ConfigClientProperties.class).length);
+		context.close();
+	}
+
+	@Test
+	public void withParent() {
+		ConfigurableApplicationContext context = new SpringApplicationBuilder(ConfigClientAutoConfiguration.class)
+				.child(Object.class).web(false).run();
+		assertEquals(1, BeanFactoryUtils.beanNamesForTypeIncludingAncestors(context,
+				ConfigClientProperties.class).length);
+		context.close();
+	}
+
+}