Use ubuntu16.04-basebuild-8c-15g instead of ubuntu16.04-basebuild-4c-8g
for periodic openonu-go tests as the ubuntu16.04-basebuild-4c-8g could
be causing some potential timing issues due to low CPU and memory in
the test environment

Change-Id: I20409744eb0b0d1b5dc70ef7b29416ff6164c44c
diff --git a/jjb/voltha-e2e.yaml b/jjb/voltha-e2e.yaml
index d4b2e36..d2f4b3c 100755
--- a/jjb/voltha-e2e.yaml
+++ b/jjb/voltha-e2e.yaml
@@ -69,7 +69,7 @@
       - 'voltha-periodic-test':
           name: 'periodic-voltha-openonu-go-test-bbsim'
           pipeline-script: 'voltha-openonu-go-test-bbsim.groovy'
-          build-node: 'ubuntu16.04-basebuild-4c-8g'
+          build-node: 'ubuntu16.04-basebuild-8c-15g'
           make-target: openonu-go-adapter-test
           make-target-1t4gemtest: 1t4gem-openonu-go-adapter-test
           make-target-1t8gemtest: 1t8gem-openonu-go-adapter-test
@@ -80,7 +80,7 @@
       - 'voltha-periodic-test':
           name: 'periodic-voltha-multiple-olts-openonu-go-test-bbsim'
           pipeline-script: 'voltha-openonu-go-test-bbsim.groovy'
-          build-node: 'ubuntu16.04-basebuild-4c-8g'
+          build-node: 'ubuntu16.04-basebuild-8c-15g'
           make-target: openonu-go-adapter-multi-olt-test
           make-target-1t4gemtest: 1t4gem-openonu-go-adapter-multi-olt-test
           make-target-1t8gemtest: 1t8gem-openonu-go-adapter-multi-olt-test