Description of problem:

FFU: openstack overcloud ffwd-upgrade prepare fails with:  u'message': u'Init Minor update failed':

2018-06-01 02:47:45Z [overcloud-AllNodesDeploySteps-gu5fxv3wdfya.ControllerPrePuppet]: DELETE_IN_PROGRESS  state changed
2018-06-01 02:47:46Z [overcloud-AllNodesDeploySteps-gu5fxv3wdfya-ControllerPrePuppet-6chp5nf3gnro]: DELETE_IN_PROGRESS  Stack DELETE started
2018-06-01 02:47:46Z [overcloud-AllNodesDeploySteps-gu5fxv3wdfya-ControllerPrePuppet-6chp5nf3gnro.ControllerPrePuppetMaintenanceModeDeployment]: DELETE_IN_PROGRESS  state changed
2018-06-01 02:47:46Z [overcloud-AllNodesDeploySteps-gu5fxv3wdfya.CephStorageConfig]: DELETE_IN_PROGRESS  state changed
2018-06-01 02:47:46Z [overcloud-AllNodesDeploySteps-gu5fxv3wdfya-CephStorageConfig-6anashbrrrau]: DELETE_IN_PROGRESS  Stack DELETE started
2018-06-01 02:47:46Z [overcloud-AllNodesDeploySteps-gu5fxv3wdfya-CephStorageConfig-6anashbrrrau.CephStoragePuppetConfigImpl]: DELETE_IN_PROGRESS  state changed
2018-06-01 02:47:47Z [overcloud-AllNodesDeploySteps-gu5fxv3wdfya.ControllerConfig]: DELETE_COMPLETE  state changed
2018-06-01 02:47:47Z [overcloud-AllNodesDeploySteps-gu5fxv3wdfya.ComputeConfig]: DELETE_COMPLETE  state changed
2018-06-01 02:47:47Z [overcloud-AllNodesDeploySteps-gu5fxv3wdfya.CephStorageConfig]: DELETE_COMPLETE  state changed
2018-06-01 02:47:51Z [overcloud-AllNodesDeploySteps-gu5fxv3wdfya.ControllerPrePuppet]: DELETE_COMPLETE  state changed
2018-06-01 02:47:51Z [overcloud-AllNodesDeploySteps-gu5fxv3wdfya]: UPDATE_COMPLETE  Stack UPDATE completed successfully
2018-06-01 02:47:52Z [AllNodesDeploySteps]: UPDATE_COMPLETE  state changed
2018-06-01 02:47:55Z [overcloud]: UPDATE_COMPLETE  Stack UPDATE completed successfully

 Stack overcloud UPDATE_COMPLETE 

Started Mistral Workflow tripleo.package_update.v1.get_config. Execution ID: e0327a73-d609-4182-9b81-894aa4759c55
Waiting for messages on queue 'tripleo' with no timeout.
{u'execution': {u'created_at': u'2018-06-01 02:47:58',
                u'id': u'e0327a73-d609-4182-9b81-894aa4759c55',
                u'input': {u'container': u'overcloud',
                           u'queue_name': u'tripleo'},
                u'name': u'tripleo.package_update.v1.get_config',
                u'params': {u'namespace': u''},
                u'spec': {u'input': [u'container',
                                     {u'queue_name': u'tripleo'}],
                          u'name': u'get_config',
                          u'tags': [u'tripleo-common-managed'],
                          u'tasks': {u'get_config': {u'action': u'tripleo.config.get_overcloud_config container=<% $.container %>',
                                                     u'name': u'get_config',
                                                     u'on-complete': u'send_message',
                                                     u'publish': {u'message': u'<% task().result %>',
                                                                  u'status': u'SUCCESS'},
                                                     u'publish-on-error': {u'message': u'Init Minor update failed',
                                                                           u'status': u'FAILED'},
                                                     u'type': u'direct',
                                                     u'version': u'2.0'},
                                     u'send_message': {u'action': u'zaqar.queue_post',
                                                       u'input': {u'messages': {u'body': {u'payload': {u'execution': u'<% execution() %>',
                                                                                                       u'message': u"<% $.get('message', '') %>",
                                                                                                       u'status': u"<% $.get('status', 'SUCCESS') %>"},
                                                                                          u'type': u'tripleo.package_update.v1.package_update_plan'}},
                                                                  u'queue_name': u'<% $.queue_name %>'},
                                                       u'name': u'send_message',
                                                       u'on-success': [{u'fail': u'<% $.get(\'status\') = "FAILED" %>'}],
                                                       u'type': u'direct',
                                                       u'version': u'2.0'}},
                          u'version': u'2.0'},
                u'updated_at': u'2018-06-01 02:47:58'},
 u'message': u'Init Minor update failed',
 u'status': u'FAILED'}


Version-Release number of selected component (if applicable):
python-tripleoclient-9.2.1-12.el7ost.noarch

How reproducible:
100%

Steps to Reproduce:
1. Deploy OSP10 with 3 controller + 2 compute nodes + 3 ceph OSD nodes
2. Upgrade undercloud to OSP11/12/13
3. Convert deprecated parameters to their new correspondents according to https://doc-stage.usersys.redhat.com/documentation/en-us/red_hat_openstack_platform/13/html-single/fast_forward_upgrades/#preparing_for_deprecated_parameters

Parameters converted: OvercloudControlFlavor, NovaComputeExtraConfig, NovaComputeSchedulerHints, NovaComputeIPs
4. Run  openstack overcloud ffwd-upgrade prepare:

openstack overcloud ffwd-upgrade prepare --templates /usr/share/openstack-tripleo-heat-templates \
-e /usr/share/openstack-tripleo-heat-templates/environments/network-isolation.yaml \
-e /usr/share/openstack-tripleo-heat-templates/environments/network-management.yaml \
-e /usr/share/openstack-tripleo-heat-templates/environments/storage-environment.yaml \
-e /usr/share/openstack-tripleo-heat-templates/environments/tls-endpoints-public-ip.yaml \
-e ~/openstack_deployment/environments/enable-cpu-pinning.yaml \
-e ~/openstack_deployment/environments/nodes.yaml \
-e ~/openstack_deployment/environments/network-environment.yaml \
-e ~/openstack_deployment/environments/disk-layout.yaml \
-e ~/openstack_deployment/environments/public_vip.yaml \
-e ~/openstack_deployment/environments/enable-tls.yaml \
-e ~/openstack_deployment/environments/inject-trust-anchor.yaml \
-e ~/openstack_deployment/environments/scheduler_hints_env.yaml \
-e ~/openstack_deployment/environments/ips-from-pool-all.yaml \
-e ~/openstack_deployment/environments/neutron-settings.yaml \
-e ~/openstack_deployment/environments/custom_hiera.yaml \
-e $HOME/ffu_repos.yaml \
--container-registry-file /home/stack/virt/docker-images.yaml \

Actual results:
Fails.

Expected results:
Doesn't fail.

Additional info:
Attaching sosreport and ffwd prepare output.