Fix missing newline in service inspect --pretty

Printing off networks as part of --pretty was missing a newline, causing
the next thing printed to be concatenated onto the end of the line.
Added an empty println after all networks are printed.

Signed-off-by: Drew Erny <drew.erny@docker.com>
(cherry picked from commit 02ebaf364f)
Signed-off-by: Tibor Vass <tibor@docker.com>

api/client/service/inspect.go

@@ -149,6 +149,7 @@ func printService(out io.Writer, service swarm.Service) {
 		for _, n := range service.Spec.Networks {
 			fmt.Fprintf(out, " %s", n.Target)
 		}
+		fmt.Fprintln(out, "")
 	}
 
 	if len(service.Endpoint.Ports) > 0 {