Upgrade to Spring Boot 2.1.x

- Simple boot 2.1.x upgrade
- Pump up gradle to 4.4 as required
- Allow one test to override bean as that's what it does
- Fixes #602

build.gradle

@@ -1,7 +1,7 @@
 buildscript {
 	ext {
 		log4jVersion = '1.2.17'
-		springBootVersion = '2.0.3.RELEASE'
+		springBootVersion = '2.1.0.RELEASE'
 		eclipsePersistenceVersion = '2.1.1'
 		kryoVersion = '3.0.3'
 		springCloudClusterVersion = '1.0.2.RELEASE'
@@ -661,7 +661,7 @@ configure(rootProject) {
 
 	task wrapper(type: Wrapper) {
 		description = 'Generates gradlew[.bat] scripts'
-		gradleVersion = '4.1'
+		gradleVersion = '4.4.1'
 	}
 
 }

gradle.properties

@@ -1 +1 @@
-version=2.0.4.BUILD-SNAPSHOT
+version=2.1.0.BUILD-SNAPSHOT

gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4.1-bin.zip

spring-statemachine-samples/eventservice/src/test/java/demo/eventservice/EventServiceTests.java

@@ -46,7 +46,8 @@ import demo.eventservice.StateMachineConfig.Events;
 import demo.eventservice.StateMachineConfig.States;
 
 @RunWith(SpringJUnit4ClassRunner.class)
-@SpringBootTest(classes = { Application.class, Config.class })
+@SpringBootTest(classes = { Application.class,
+		Config.class }, properties = "spring.main.allow-bean-definition-overriding=true")
 @WebAppConfiguration
 @DirtiesContext(classMode = ClassMode.AFTER_EACH_TEST_METHOD)
 public class EventServiceTests {