Remove long package names from samples

Long package names are really unnecessary in samples and they
just clutter things up. Also Spring Loaded doesn't work with
org.sfw packages, so to demo that technology you need a
different package name.

spring-boot-samples/spring-boot-sample-web-ui/src/main/java/sample/ui/InMemoryMessageRespository.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.sample.ui;
+package sample.ui;
 
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;

spring-boot-samples/spring-boot-sample-web-ui/src/main/java/sample/ui/Message.java

@@ -11,7 +11,7 @@
  * specific language governing permissions and limitations under the License.
  */
 
-package org.springframework.boot.sample.ui;
+package sample.ui;
 
 import java.util.Calendar;
 

spring-boot-samples/spring-boot-sample-web-ui/src/main/java/sample/ui/MessageRepository.java

@@ -11,7 +11,7 @@
  * specific language governing permissions and limitations under the License.
  */
 
-package org.springframework.boot.sample.ui;
+package sample.ui;
 
 /**
  * @author Rob Winch

spring-boot-samples/spring-boot-sample-web-ui/src/main/java/sample/ui/SampleWebUiApplication.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.sample.ui;
+package sample.ui;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

spring-boot-samples/spring-boot-sample-web-ui/src/main/java/sample/ui/mvc/MessageController.java

@@ -11,13 +11,13 @@
  * specific language governing permissions and limitations under the License.
  */
 
-package org.springframework.boot.sample.ui.mvc;
+package sample.ui.mvc;
 
 import javax.validation.Valid;
 
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.sample.ui.Message;
-import org.springframework.boot.sample.ui.MessageRepository;
+import sample.ui.Message;
+import sample.ui.MessageRepository;
 import org.springframework.stereotype.Controller;
 import org.springframework.validation.BindingResult;
 import org.springframework.web.bind.annotation.ModelAttribute;