With Tomcat, support APR (if available) by default

Adds AprLifecycleListener to the Tomcat listeners.

Fixes spring-projects#7376

Author: candrews

spring-boot/src/main/java/org/springframework/boot/web/embedded/tomcat/TomcatServletWebServerFactory.java

@@ -50,6 +50,7 @@
 import org.apache.catalina.WebResourceSet;
 import org.apache.catalina.Wrapper;
 import org.apache.catalina.connector.Connector;
+import org.apache.catalina.core.AprLifecycleListener;
 import org.apache.catalina.loader.WebappLoader;
 import org.apache.catalina.session.StandardManager;
 import org.apache.catalina.startup.Tomcat;
@@ -122,7 +123,9 @@ public class TomcatServletWebServerFactory extends AbstractServletWebServerFacto
 
 	private List<Valve> contextValves = new ArrayList<>();
 
-	private List<LifecycleListener> contextLifecycleListeners = new ArrayList<>();
+	private List<LifecycleListener> contextLifecycleListeners = new ArrayList<>(Arrays.asList(
+			new AprLifecycleListener()
+		));
 
 	private List<TomcatContextCustomizer> tomcatContextCustomizers = new ArrayList<>();