updated upgrade scripts.

gce-properties.yml

diff --git a/gce-properties.yml b/gce-properties.yml
index ef1cd09..edc6681 100644
--- a/gce-properties.yml
+++ b/gce-properties.yml
@@ -1,9 +1,9 @@
 ---
 credentials_file: ~/.apigee-secure/default-service-account.json
 #machine_type: 'n1-highmem-8'
-machine_type: 'n1-standard-8'
+#machine_type: 'n1-standard-8'
 #machine_type: 'n1-standard-4'
-#machine_type: 'n1-standard-2'
+machine_type: 'n1-standard-2'
 #image: 'centos-7-v20180104'
 image: 'centos-7'
 #image: 'centos-7-v20170918'