Added cleanup code to the failing AWS test

spring-cloud-function-adapters/spring-cloud-function-adapter-aws/src/test/java/org/springframework/cloud/function/adapter/aws/SpringBootStreamHandlerTests.java

@@ -23,6 +23,8 @@ import java.util.Map;
 import java.util.function.Function;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
+
+import org.junit.Before;
 import org.junit.Test;
 import reactor.core.publisher.Flux;
 
@@ -44,6 +46,11 @@ public class SpringBootStreamHandlerTests {
 
 	private SpringBootStreamHandler handler;
 
+	@Before
+	public void before() {
+		System.clearProperty("function.name");
+	}
+
 	@Test
 	public void functionBeanWithJacksonConfig() throws Exception {
 		this.handler = new SpringBootStreamHandler(FunctionConfigWithJackson.class);