Mongo 3.2 expects xenial, which means bootstrapping

playbooks/edx-east/mongo_3_2.yml

@@ -10,6 +10,12 @@
 # ADDING A NEW CLUSTER MEMBER
 # If you are adding a member to a cluster, you must be sure that the new machine is not first in your inventory
 # ansible-playbook mongo_3_2.yml -i 203.0.113.11,203.0.113.12,new-machine-ip -e@/path/to/edx.yml -e@/path/to/ed.yml
+- name: Bootstrap instance(s)
+  hosts: all
+  gather_facts: no
+  become: True
+  roles:
+    - python
 - name: Deploy MongoDB
   hosts: all
   become: True