Refactor actuator package locations

Restructure actuator packages to improve structure. The following
changes have been made:

 - Separate actuator and actuator auto-configuration into different
   modules.
 - Move endpoint code into `spring-boot-actuator`.
 - Move `Endpoint` implementations from a single package into
   technology specific packages.
 - Move `HealthIndicator` implementations from a single package into
   technology specific packages.
 - As much as possible attempt to mirror the `spring-boot` package
   structure and class naming in `spring-boot-actuator` and
   `spring-boot-actuator-autoconfigure`.
 - Move `DataSourceBuilder` and DataSource meta-data support from
   `spring-boot-actuator` to `spring-boot`.

Fixes gh-10261

spring-boot-samples/spring-boot-sample-actuator-custom-security/src/test/java/sample/actuator/customsecurity/InsecureManagementPortAndPathSampleActuatorApplicationTests.java

@@ -19,7 +19,7 @@ package sample.actuator.customsecurity;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import org.springframework.boot.actuate.web.server.LocalManagementPort;
+import org.springframework.boot.actuate.autoconfigure.web.server.LocalManagementPort;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.test.web.client.TestRestTemplate;

spring-boot-samples/spring-boot-sample-actuator-noweb/src/test/java/sample/actuator/noweb/SampleActuatorNoWebApplicationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 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.
@@ -20,7 +20,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.actuate.endpoint.MetricsEndpoint;
+import org.springframework.boot.actuate.metrics.MetricsEndpoint;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.junit4.SpringRunner;

spring-boot-samples/spring-boot-sample-actuator-ui/src/test/java/sample/actuator/ui/SampleActuatorUiApplicationPortTests.java

@@ -21,7 +21,7 @@ import java.util.Map;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import org.springframework.boot.actuate.web.server.LocalManagementPort;
+import org.springframework.boot.actuate.autoconfigure.web.server.LocalManagementPort;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.test.web.client.TestRestTemplate;

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

@@ -21,7 +21,7 @@ import java.util.Map;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import org.springframework.boot.actuate.web.server.LocalManagementPort;
+import org.springframework.boot.actuate.autoconfigure.web.server.LocalManagementPort;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.test.web.client.TestRestTemplate;

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

@@ -21,7 +21,7 @@ import java.util.Map;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import org.springframework.boot.actuate.web.server.LocalManagementPort;
+import org.springframework.boot.actuate.autoconfigure.web.server.LocalManagementPort;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.test.web.client.TestRestTemplate;

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

@@ -21,7 +21,7 @@ import java.util.Map;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import org.springframework.boot.actuate.web.server.LocalManagementPort;
+import org.springframework.boot.actuate.autoconfigure.web.server.LocalManagementPort;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.test.web.client.TestRestTemplate;

spring-boot-samples/spring-boot-sample-metrics-redis/src/main/java/sample/metrics/redis/AggregateMetricsConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 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.
@@ -16,11 +16,11 @@
 
 package sample.metrics.redis;
 
-import org.springframework.boot.actuate.endpoint.MetricReaderPublicMetrics;
-import org.springframework.boot.actuate.endpoint.PublicMetrics;
+import org.springframework.boot.actuate.metrics.PublicMetrics;
 import org.springframework.boot.actuate.metrics.aggregate.AggregateMetricReader;
 import org.springframework.boot.actuate.metrics.export.MetricExportProperties;
 import org.springframework.boot.actuate.metrics.reader.MetricReader;
+import org.springframework.boot.actuate.metrics.reader.MetricReaderPublicMetrics;
 import org.springframework.boot.actuate.metrics.repository.redis.RedisMetricRepository;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;