Now that Windows base images can be loaded directly into docker via "docker load" of a specialized tar file (with docker pull support on the horizon) we no longer have need of the custom images code path that loads images from a shared central location. Removing that code and it's call points. Signed-off-by: Stefan J. Wernli <swernli@microsoft.com> Upstream-commit: 3e109f349ff42ea1a0f555b6e645c51d9bc1539b Component: engine