Comment 2 for bug 1793468

http://logs.openstack.org/45/560445/144/check/tripleo-ci-centos-7-containers-multinode-queens/dcb313c/logs/undercloud/home/zuul/overcloud_prep_containers.log.txt.gz#_2018-09-19_23_07_47
2018-09-19 23:07:47 | 2018-09-19 23:07:47,010 INFO:
2018-09-19 23:07:47 | 2018-09-19 23:07:47,010 ERROR: Failed running yum update for 192.168.24.1:8787/tripleoqueens/centos-binary-horizon:current-tripleo; try number 2
2018-09-19 23:07:47 | 2018-09-19 23:07:47,010 ERROR: /usr/bin/docker-current: Error response from daemon: grpc: the connection is unavailable.
2018-09-19 23:07:47 | time="2018-09-19T23:07:47Z" level=error msg="error getting events from daemon: net/http: request canceled"