fix the duplicate entry of rabbitmq_refresh

playbooks/edx-east/edx_provision.yml

@@ -34,7 +34,6 @@
       dns_name: "{{ dns_name }}"
       dns_zone: "{{ dns_zone }}"
       zone: "{{ zone }}"
-      vpc_subnet_id: "{{ vpc_subnet_id }}"
       assign_public_ip: yes
       terminate_instance: true
       instance_profile_name: sandbox