Upgrade to Kotlin 1.1-beta-17

Spring Framework 5.0 now requires Kotlin 1.1+. This commit
also re-enable Kotlin JSR 223 unit tests.

Issue: SPR-15100

spring-web-reactive/src/test/java/org/springframework/web/reactive/result/view/script/KotlinScriptTemplateTests.java

@@ -21,7 +21,6 @@ import java.util.Map;
 
 import static org.junit.Assert.assertEquals;
 import org.junit.Before;
-import org.junit.Ignore;
 import org.junit.Test;
 
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
@@ -41,7 +40,6 @@ import org.springframework.web.server.session.WebSessionManager;
  *
  * @author Sebastien Deleuze
  */
-@Ignore // Temporary disabled since Kotlin 1.1-M04 generates bytecode not Kotlin 1.0 compliant, will be enable as soon as Kotlin 1.1-M05 is available
 public class KotlinScriptTemplateTests {
 
 	private StaticApplicationContext context;

spring-web-reactive/src/test/resources/META-INF/services/javax.script.ScriptEngineFactory

@@ -0,0 +1 @@
+org.jetbrains.kotlin.script.jsr223.KotlinJsr223JvmLocalScriptEngineFactory