Upgrade maven-surefire-plugin from 2.7.2 to 2.18.1

 * 2.18.1 reports test failures much better, with a relevant
   part of stacktrace as well

 * using <runOrder> to make the tests more predictable
   (without the confi one test failing, likely because of some
   previous test did not properly clean-up after itself)

pom.xml

@@ -151,8 +151,9 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.7.2</version>
+                <version>2.18.1</version>
                 <configuration>
+                    <runOrder>alphabetical</runOrder>
                     <childDelegation>true</childDelegation>
                     <systemProperties>
                         <property>