ARTEMIS-1276 avoid System.exit in tests as Surefire cannot deal with that

This change results in many more tests being run. Previously, 662 tests
were executed. Now, 1166 tests is executed. The running time has increased
from ~20 minutes to ~50 minutes.

tests/activemq5-unit-tests/pom.xml

@@ -435,6 +435,9 @@
             <artifactId>maven-surefire-plugin</artifactId>
             <configuration>
                <skipTests>${skipActiveMQ5Tests}</skipTests>
+               <systemPropertyVariables>
+                  <org.apache.activemq.AutoFailTestSupport.disableSystemExit>true</org.apache.activemq.AutoFailTestSupport.disableSystemExit>
+               </systemPropertyVariables>
 <!--
                <additionalClasspathElements>
                   <additionalClasspathElement>src/main/resources/stomp</additionalClasspathElement>

tests/activemq5-unit-tests/src/test/java/org/apache/activemq/AutoFailTestSupport.java

@@ -89,6 +89,7 @@ public abstract class AutoFailTestSupport extends TestCase {
                      System.exit(EXIT_ERROR);
                   } else {
                      LOG.error("No system.exit as it kills surefire - forkedProcessTimeoutInSeconds (surefire.timeout) will kick in eventually see pom.xml surefire plugin config");
+                     fail("Timeout in AutoFailTestSupport class has been exceeded");
                   }
                }
             }