Tiller residue breaks the kubeadm jobs

[zhaoleilc]

Description
===========
The tiller chart has been removed[1], but there is a residue
that breaks the kubeadm jobs[2].

[1] https://review.opendev.org/c/openstack/openstack-helm-infra/+/788592
[2] https://opendev.org/openstack/openstack-helm-infra/src/branch/master/tools/images/kubeadm-aio/Dockerfile#L50

Environment
===========
Latest version of openstack-helm-infra

Logs & Configs
==============
+ mv -v /tmp/source/tiller /opt/charts/
mv: cannot stat '/tmp/source/tiller': No such file or directory
Removing intermediate container ba7b8eb22f08
The command '/bin/sh -c set -ex ; cp -rfav /tmp/source/tools/images/kubeadm-aio/assets/* / ; IFS=','; for CHART in $CHARTS; do mv -v /tmp/source/${CHART} /opt/charts/; done ; rm -rf /tmp/source' returned a non-zero code: 1