Define and use the project.test.outputDirectory property.

pom.xml

@@ -768,7 +768,7 @@
 						<threadCountClasses>10</threadCountClasses>
 						<forkCount>3</forkCount> <!-- 3 JVMs at build time -->
 						<reuseForks>true</reuseForks> <!-- reuse the JVMs across classes -->
-						<reportsDirectory>${project.build.directory}/surefire-reports</reportsDirectory>
+						<reportsDirectory>${project.test.outputDirectory}</reportsDirectory>
 					</configuration>
 				</plugin>
 
@@ -1085,6 +1085,8 @@
 		<!-- default value for the distro directory -->
 		<distroDirectory>distro</distroDirectory>
 
+		<project.test.outputDirectory>${project.build.directory}/surefire-reports</project.test.outputDirectory>
+
 		<java_version>1.8</java_version>
 		<java.expected.vm>.*OpenJDK.*</java.expected.vm>
 		<maven.compiler.source>${java_version}</maven.compiler.source>