upgrade surefire to 2.7.1 : faster and won't use anymore this shared /var/tmp on my solaris server

pom.xml

@@ -117,7 +117,7 @@ THE SOFTWARE.
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-surefire-plugin</artifactId>
-          <version>2.6</version>
+          <version>2.7.1</version>
           <configuration>
             <systemPropertyVariables>
               <java.io.tmpdir>${project.build.directory}</java.io.tmpdir>