Retry on ContentTooShortError [Train backport] #1129
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This patch makes the download_image() to retry automatically on ContentTooShortError exception, this is an issue that has been seen on the gate, see [0].
[0] https://openstack-ci-reports.ubuntu.com/artifacts/3ae/891712/3/check/focal-wallaby-pacemaker-remote-ssl_masakari/3ae840c/job-output.txt
(cherry picked from commit 91c1cc3)