If the ci images do not have any cached data
we should ignore any error when trying to copying it.
This is requried when using unmodified cloud images.
Change-Id: Ia6e94fc01343d0c292b1477905f8a96a6b43bcf8
This should be managed in the devstack repo, since it's a base job to
run devstack.
Change-Id: Iffe54fbccbccd68db08f79a1b51dd7f76dbff408
Depends-On: Ie2119f24360d56690ffd772b95a9ea6b98dd4a39