Look like using docker proxy is slower and less stable than pulling from
dockerhub directly and contributes to some part of unstable builds.
This reverts commit e3f14aaff35364b84acedf53b3778111cbae0373.
Change-Id: I9735ad35ce9240f610479a56eaa38715defa2e04
Signed-off-by: Andrii Ostapenko <andrii.ostapenko@att.com>