Skip lazy init for beans that explicitly set lazy to false

This commit also adds tests to ensure that the child
management context works when lazy initialization is
enabled. Also, it adds a BeanFactoryPostProcessor to
the child context so that the server is created and
listening for requests but other beans in the child
context are not created until requested.

See gh-16184

spring-boot-samples/spring-boot-sample-actuator/src/test/java/sample/actuator/ManagementPortWithLazyInitializationTests.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2012-2019 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
+ *
+ *      https://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 sample.actuator;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.boot.actuate.autoconfigure.web.server.LocalManagementPort;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Integration tests for separate management and main service ports when
+ * lazy-initialization is enabled.
+ *
+ * @author Madhura Bhave
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, properties = {
+		"management.server.port=0", "spring.main.lazy-initialization=true" })
+public class ManagementPortWithLazyInitializationTests {
+
+	@LocalManagementPort
+	private int managementPort;
+
+	@Test
+	public void testHealth() {
+		ResponseEntity<String> entity = new TestRestTemplate()
+				.withBasicAuth("user", "password").getForEntity(
+						"http://localhost:" + this.managementPort + "/actuator/health",
+						String.class);
+		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
+		assertThat(entity.getBody()).contains("\"status\":\"UP\"");
+	}
+
+}