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43e8730ffe
In bce3bd9031fa78c79173f29bcac5bc49c81a03b4, we added support for podman for building and running the SDK container. The presence of podman is auto-detected in sdk_container_common.sh. However, podman is preverred over docker, requiring users to use *sudo* (which podman requires and docker does not). This change uses docker when present, podman otherwise. It also improves podman detection - 'podman' uses argv[0] in its version string, so if 'docker' is a symlink to 'podman', 'podman --version' output uses 'docker'. This broke the SDK container on hosts which have a 'docker' symlink to 'podman' since 'podman' is then run w/o 'sudo'. Signed-off-by: Thilo Fromm <thilo@kinvolk.io>