updated props

gce-properties.yml

diff --git a/gce-properties.yml b/gce-properties.yml
index da1c333..5e0631c 100644
--- a/gce-properties.yml
+++ b/gce-properties.yml
@@ -9,7 +9,8 @@
 #image: 'centos-7-v20180104'
 #image_family: 'centos-7-drawfork'
 #image_family: 'centos-7-drawfork-v20180327'
-image: 'centos-7'
+#image: 'centos-7'
+image: 'centos-7-v20180327'
 #image: 'centos-7-v20170918'
 #image: 'centos-7-v20160511'
 #image: 'centos-6-v20170918'