_docker_run and _docker_create had only one differing line. This refactoring features: - direct completion for both commands to the same function - factor out the common arguments, sort & format them nicely - compute the argument for _docker_pos_first_nonflag. Signed-off-by: Harald Albers <github@albersweb.de> Upstream-commit: 46b104bd3977c4777b0d99ba6c190f37ae780245 Component: engine