docker-ce: fix hosts type to list

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

utils/docker-ce/files/etc/config/dockerd

@@ -3,7 +3,7 @@ config globals 'globals'
 #	option alt_config_file "/etc/docker/daemon.json"
 	option data_root "/opt/docker/"
 	option log_level "warn"
-	option hosts "unix://var/run/docker.sock"
+	list hosts "unix:///var/run/docker.sock"
 	# If the bip option is changed, dockerd must be restarted.
 	# A service reload is not enough.
 	option bip "172.18.0.1/24"