contrib/completion: remove aufs, legacy overlay

The AuFS and (legacy) overlay storage drivers have been deprecated and
removed, so remove them from the completion scripts.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

contrib/completion/bash/docker

@@ -2649,7 +2649,7 @@ _docker_daemon() {
 			return
 			;;
 		--storage-driver|-s)
-			COMPREPLY=( $( compgen -W "aufs btrfs overlay2 vfs zfs" -- "$(echo "$cur" | tr '[:upper:]' '[:lower:]')" ) )
+			COMPREPLY=( $( compgen -W "btrfs overlay2 vfs zfs" -- "$(echo "$cur" | tr '[:upper:]' '[:lower:]')" ) )
 			return
 			;;
 		--storage-opt)

contrib/completion/zsh/_docker

@@ -2777,7 +2777,7 @@ __docker_subcommand() {
                 "($help)--raw-logs[Full timestamps without ANSI coloring]" \
                 "($help)*--registry-mirror=[Preferred registry mirror]:registry mirror: " \
                 "($help)--seccomp-profile=[Path to seccomp profile]:path:_files -g \"*.json\"" \
-                "($help -s --storage-driver)"{-s=,--storage-driver=}"[Storage driver to use]:driver:(aufs btrfs devicemapper overlay overlay2 vfs zfs)" \
+                "($help -s --storage-driver)"{-s=,--storage-driver=}"[Storage driver to use]:driver:(btrfs devicemapper overlay2 vfs zfs)" \
                 "($help)--selinux-enabled[Enable selinux support]" \
                 "($help)--shutdown-timeout=[Set the shutdown timeout value in seconds]:time: " \
                 "($help)*--storage-opt=[Storage driver options]:storage driver options: " \