Migrate spring.view properties

Migrate `spring.view.prefix` and `spring.view.suffix` to
`spring.mvc.view.prefix` and `spring.mvc.view.suffix` respectively. The
former properties are still handled in a backward compatible way and are
defined as deprecated in the meta-data.

Closes gh-3250

spring-boot-samples/spring-boot-sample-web-jsp/src/main/resources/application.properties

@@ -1,3 +1,3 @@
-spring.view.prefix: /WEB-INF/jsp/
-spring.view.suffix: .jsp
+spring.mvc.view.prefix: /WEB-INF/jsp/
+spring.mvc.view.suffix: .jsp
 application.message: Hello Phil