Bump to latest 2.5 spring boot release

Contains feedback from @Kehrlann

Original commit by @abelsromero - amended to keep compatibility with Spring Boot 2

Add integration tests
* use Maven modules to do so
* spring-cloud-bindings goes one level down
* addition of a spring-cloud-bindings parent

Inspired by @gregturn and spring-data-rest

Integrate PR#94 comments from @Kehrlann

* move bindings to src/test/resources
* get rid of unused / duplicate annotations
* move all dependencies to test scope for test projects

Spring Boot 2 support
* only in branch 1.x, SB3 support is in main branch

spring-cloud-bindings-tests/src/test/java/org/springframework/cloud/IntegrationTest.java

@@ -0,0 +1,21 @@
+package org.springframework.cloud;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.data.redis.core.RedisTemplate;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@SpringBootTest(classes = RedisServerTestConfiguration.class)
+public class IntegrationTest {
+
+	@Autowired
+	private RedisTemplate redisTemplate;
+
+	@Test
+	public void shouldSaveUser_toRedis() {
+		redisTemplate.opsForValue().set("hello", "world");
+		assertTrue(redisTemplate.hasKey("hello"));
+	}
+}

spring-cloud-bindings-tests/src/test/java/org/springframework/cloud/RedisServerTestConfiguration.java

@@ -0,0 +1,33 @@
+package org.springframework.cloud;
+
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.core.io.ClassPathResource;
+import redis.embedded.RedisServer;
+
+import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
+import java.io.IOException;
+import java.util.Scanner;
+
+@TestConfiguration
+public class RedisServerTestConfiguration {
+
+    private final RedisServer redisServer;
+
+    public RedisServerTestConfiguration() throws IOException {
+        try (Scanner scanner = new Scanner(new ClassPathResource("bindings/redis/port").getInputStream())) {
+            int port = scanner.nextInt();
+            this.redisServer = new RedisServer(port);
+        }
+    }
+
+    @PostConstruct
+    public void postConstruct() {
+        redisServer.start();
+    }
+
+    @PreDestroy
+    public void preDestroy() {
+        redisServer.stop();
+    }
+}

spring-cloud-bindings-tests/src/test/java/org/springframework/cloud/SpringBoot2Application.java

@@ -0,0 +1,7 @@
+package org.springframework.cloud;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringBoot2Application {
+}

spring-cloud-bindings-tests/src/test/resources/bindings/redis/host

@@ -0,0 +1 @@
+localhost

spring-cloud-bindings-tests/src/test/resources/bindings/redis/port

@@ -0,0 +1 @@
+4242

spring-cloud-bindings-tests/src/test/resources/bindings/redis/type

@@ -0,0 +1 @@
+redis