refactor: use variable to decide if we want autofs mount

ansible/group_vars/all

@@ -22,6 +22,7 @@
   ldap_uri: "ldap://ldapserver"
 
 # nfs_mounts related
+  use_autofs: false
   mount_points:
     - /gpfs4
     - /gpfs5

ansible/roles/nfs_mounts/tasks/main.yml

 ---
 - name: nfs_mounts using fstab
   include_tasks: fstab.yml
-  when: "'proxy' in group_names"
+  when: not use_autofs
 
 - name: nfs_mounts using autofs
   include_tasks: autofs.yml
-  when: "'proxy' not in group_names"
+  when: use_autofs