periodic fs030 failing at evaluating conditional (number_of_controllers|int < 3): 'number_of_controllers'

http://logs.rdoproject.org/openstack-periodic/git.openstack.org/openstack-infra/tripleo-ci/master/periodic-tripleo-ci-centos-7-multinode-1ctlr-featureset030-master/47ff46b/job-output.txt.gz
2019-04-10 00:27:49.570884 | primary | fatal: [undercloud]: FAILED! => {}
2019-04-10 00:27:49.570933 | primary |
2019-04-10 00:27:49.570958 | primary | MSG:
2019-04-10 00:27:49.570975 | primary |
2019-04-10 00:27:49.571233 | primary | The conditional check 'number_of_controllers|int < 3' failed. The error was: error while evaluating conditional (number_of_controllers|int < 3): 'number_of_controllers' is undefined
2019-04-10 00:27:49.571867 | primary |
2019-04-10 00:27:49.572115 | primary | The error appears to have been in '/home/zuul/workspace/.quickstart/usr/local/share/ansible/roles/overcloud-deploy/tasks/pre-deploy.yml': line 176, column 3, but may
2019-04-10 00:27:49.572490 | primary | be elsewhere in the file depending on the exact syntax problem.
2019-04-10 00:27:49.572516 | primary |
2019-04-10 00:27:49.572590 | primary | The offending line appears to be:
2019-04-10 00:27:49.572613 | primary |
2019-04-10 00:27:49.572629 | primary |
2019-04-10 00:27:49.572672 | primary | - name: disable L3 HA
2019-04-10 00:27:49.572698 | primary | ^ here
2019-04-10 00:27:49.572715 | primary |

Could be related to the merge of https://review.openstack.org/#/q/topic:scale-options+(status:open+OR+status:merged)