http: switch to maven-surefire-plugin 2.12.4

https://codereview.appspot.com/6854044/

Author: Yaniv Inbar

pom.xml

@@ -276,7 +276,10 @@
         </plugin>
         <plugin>
           <artifactId>maven-surefire-plugin</artifactId>
-          <version>2.8.1</version>
+          <version>2.12.4</version>
+          <configuration>
+            <argLine>-Xmx1024m</argLine>
+          </configuration>
         </plugin>
         <plugin>
           <artifactId>maven-war-plugin</artifactId>