zsh: update zsh completion for docker command
zsh: update zsh completion for docker command

zsh completion is updated with the content of
felixr/docker-zsh-completion.

The major change since the last merge is the removal of use of
sed/awk. This should help a lot OSX users who previously had to install
gawk and gsed.

Docker-DCO-1.1-Signed-off-by: Vincent Bernat <vincent@bernat.im> (github: vincentbernat)

e11137/cli,thaJeztah/cli,redpanda/cli,allencloud/cli,ashfall/cli,cpuguy83/cli,docker/cli,docker/cli,dnephin/cli,cpuguy83/cli,dnephin/cli,thaJeztah/cli,allencloud/cli,riyazdf/cli,riyazdf/cli,Zebrilee/cli,e11137/cli,ashfall/cli,Zebrilee/cli,redpanda/cli