worked to resolve collision between these roles.

gce-create-instances.yml

diff --git a/gce-create-instances.yml b/gce-create-instances.yml
index 0dd8d4d..9d039f4 100644
--- a/gce-create-instances.yml
+++ b/gce-create-instances.yml
@@ -28,7 +28,7 @@
       credentials_file: '{{ credentials_file }}'
       state: present
       tags: "{{ default_firewall_tags }}"
-      metadata: "{ 'startup-script': 'sudo sed -i \"s/^.*requiretty/Defaults !requiretty/\" /etc/sudoers' }"
+      metadata: "{ 'startup-script': 'sudo echo 'Defaults \!requiretty' >> /etc/sudoers.d/remove-requiretty' }"
     register: gce
 
 #  - name: Create firewall rule