Document Cloud Foundry actuator endpoint support

Add a Cloud Foundry specific section to "Production Ready Features".

See gh-7108

spring-boot-docs/src/main/java/org/springframework/boot/cloudfoundry/CloudFoundryIgnorePathsExample.java

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+/*
+ * Copyright 2012-2016 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.boot.cloudfoundry;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+
+/**
+ * Example for custom Cloud Foundry actuator ignored paths.
+ *
+ * @author Phillip Webb
+ */
+public class CloudFoundryIgnorePathsExample {
+
+	@Configuration
+	static class CustomSecurityConfiguration extends WebSecurityConfigurerAdapter {
+
+		// @formatter:off
+		// tag::security[]
+		@Override
+		protected void configure(HttpSecurity http) throws Exception {
+			http
+				.authorizeRequests()
+					.mvcMatchers("/cloudfoundryapplication/**")
+						.permitAll()
+					.mvcMatchers("/mypath")
+						.hasAnyRole("SUPERUSER")
+					.anyRequest()
+						.authenticated().and()
+				.httpBasic();
+		}
+		// end::security[]
+		// @formatter:on
+
+	}
+
+}