Move Embedded Redis classes to org.springframework.session.redis.embedded

This prevents the embedded redis from being picked up in ComponentScan
in any of the samples unless the @EnableEmebeddedRedis annotation is used.

Polish gh-184

samples/spring-embedded-redis/src/main/java/org/springframework/session/redis/embedded/EmbeddedRedisConfiguration.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package sample;
+package org.springframework.session.redis.embedded;
 
 import java.io.IOException;
 import java.net.ServerSocket;

samples/spring-embedded-redis/src/main/java/org/springframework/session/redis/embedded/EnableEmbeddedRedis.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package sample;
+package org.springframework.session.redis.embedded;
 
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;

samples/spring-embedded-redis/src/main/java/org/springframework/session/redis/embedded/RedisServerPort.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package sample;
+package org.springframework.session.redis.embedded;
 
 import java.lang.annotation.Documented;
 import java.lang.annotation.ElementType;