Geode: Updates to make builds more stable

Change-Id: Id6be87daa0a795831a83efdb4bb52975e953733e
diff --git a/jjb/geode/apache-geode-test/apache-geode-integration-test.yaml b/jjb/geode/apache-geode-test/apache-geode-integration-test.yaml
index 45b3d6b..173d71e 100644
--- a/jjb/geode/apache-geode-test/apache-geode-integration-test.yaml
+++ b/jjb/geode/apache-geode-test/apache-geode-integration-test.yaml
@@ -29,7 +29,7 @@
     java-test-version: '11'
     parallel-gradle: 'true'
     parallel-dunit: 'true'
-    dunit-parallel-forks: '12'
+    dunit-parallel-forks: '8'
 
     jobs:
       - 'apache-geode-{test-type}Test-jdk{java-test-version}'