Description of problem:
OSP11 -> OSP12 upgrade: major upgrade composable step fails because ceph-ansible is waiting for user input:

/var/log/mistral/ceph-install-workflow.log:

2018-01-25 13:55:45,889 p=18529 u=mistral |  PLAY [confirm whether user really meant to switch from non-containerized to containerized ceph daemons] ***
2018-01-25 13:55:45,900 p=18529 u=mistral |  TASK [exit playbook, if user did not mean to switch from non-containerized to containerized daemons?] ***
2018-01-25 13:55:45,931 p=18529 u=mistral |  fatal: [localhost]: FAILED! => {"changed": false, "msg": "\"Exiting switch-from-non-containerized-to-containerized-ceph-daemons.yml playbook,\n cluster did not switch from non-containerized to containerized ceph daemons.\n To switch from non-containerized to containerized ceph daemons, either say 'yes' on the prompt or\n or use `-e ireallymeanit=yes` on the command line when\n invoking the playbook\"\n"}
2018-01-25 13:55:45,931 p=18529 u=mistral |  PLAY RECAP *********************************************************************


Version-Release number of selected component (if applicable):
[root@undercloud-0 stack]# rpm -q openstack-tripleo-heat-templates ceph-ansible
openstack-tripleo-heat-templates-7.0.3-22.el7ost.noarch
ceph-ansible-3.0.14-1.el7cp.noarch


How reproducible:
100%

Steps to Reproduce:
1. Deploy OSP11 with 3 controllers + 2 computes + 3 ceph nodes
2. Upgrade to OSP12

Actual results:
major-upgrade-composable-steps-docker fails

Expected results:
successful upgrade

Additional info:
Attaching sosreport.