Add zsh completion for 'docker service {create,update} --placement-pref'
Upstream-commit: 9e538fb4b0708af893b3fc8c0b5943eabc95f149
Component: engine
Add zsh completion for 'docker service {create,update} --placement-pref'
Upstream-commit: 9e538fb4b0708af893b3fc8c0b5943eabc95f149
Component: engine