test fix

Author: psabhay

tests/group_vars/all.yml

@@ -1,8 +1,8 @@
 ---
 
-image_name: "ubuntu-upstart:14.04"
+image_name: "ubuntu-upstart:18.04"
 mongodb_package: mongodb-org
-mongodb_version: "3.6"
+mongodb_version: "4.0"
 mongodb_storage_dbpath: /var/lib/mongodb
 mongodb_net_bindip: 0.0.0.0
 mongodb_login_host: "{{ hostvars[groups['mongo_master'][0]].ansible_default_ipv4.address }}"