Pete Birley dd92edfb58 Gate: use infra mirror when in infra for kubeadm aio image
This PS uses the infra mirrors in the kubeadm aio build when
running the gate in openstack-infra.

Change-Id: Id9a4bf2b13051dfcf5aea688511da24cd245de9c
2018-05-11 16:43:22 -05:00
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