Increase Heap size to fix test timeouts
The following tests are failing due to timeouts
because of the GC pauses.
com.facebook.presto.memory.TestMemoryManager.testQueryMemoryPerNodeLimit
com.facebook.presto.tests.TestQueryManager.testQueryCpuLimit
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
+ <argLine>-Xms4g -Xmx4g</argLine>
<!-- these tests take a very long time so only run them in the CI server -->
<excludes>
<exclude>**/TestDistributedQueriesNoHashGeneration.java</exclude>
