Make surefire-plugin fork and give it more heap

Change-Id: I160360aead41e7734b389e0513f53c8615764c96
diff --git a/pom.xml b/pom.xml
index 4a20c45..b4df2e6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -176,9 +176,11 @@
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>2.22.2</version>
                 <configuration>
+                    <forkCount>1C</forkCount>
                     <includes>
                         <include>**/*Test.java</include>
                     </includes>
+                    <argLine>-Xmx32768m</argLine>
                 </configuration>
             </plugin>
         </plugins>