Comment 1 for bug 1786520

poked a little to mark it triaged (just noticed it already is)... anyway I quickly found 3 more examples of this [0][1][2] from recent runs at [3]

[0] http://logs.openstack.org/45/560445/122/check/tripleo-ci-centos-7-3nodes-multinode/ec7b45c/logs/undercloud/home/zuul/overcloud_deploy.log.txt.gz#_2018-08-21_01_45_25

 2018-08-21 01:45:25 | fatal: [centos-7-inap-mtl01-0001422621]: FAILED! => {"msg": "An unhandled exception occurred while running the lookup plugin 'file'. Error was a <class 'ansible.errors.AnsibleError'>, original message: could not locate file in lookup: ControllerApi/centos-7-inap-mtl01-0001422620/UpgradeInitDeployment"}

[1] http://logs.openstack.org/19/581919/22/check/tripleo-ci-centos-7-3nodes-multinode/2638bd8/logs/undercloud/home/zuul/overcloud_deploy.log.txt.gz#_2018-08-21_01_30_16

 2018-08-21 01:30:18 | or'>, original message: could not locate file in lookup: ControllerApi/centos-7-rax-iad-0001422546/UpgradeInitDeployment"}

[2] http://logs.openstack.org/03/593903/3/check/tripleo-ci-centos-7-3nodes-multinode/17d85b2/logs/undercloud/home/zuul/overcloud_deploy.log.txt.gz#_2018-08-20_23_58_10

 2018-08-20 23:58:10 | fatal: [centos-7-ovh-bhs1-0001421868]: FAILED! => {"msg": "An unhandled exception occurred while running the lookup plugin 'file'. Error was a <class 'ansible.errors.AnsibleError'>, original message: could not locate file in lookup: ControllerApi/centos-7-ovh-bhs1-0001421871/UpgradeInitDeployment"}
 2018-08-20 23:58:10 |

[3] http://cistatus.tripleo.org/ "tripleo-ci-centos-7-3nodes-multinode"