Remove redundant error message

Currently some commands including `kill`, `pause`, `restart`, `rm`,
`rmi`, `stop`, `unpause`, `udpate`, `wait` will print a lot of error
message on client side, with a lot of redundant messages, this commit is
trying to remove the unuseful and redundant information for user.

Signed-off-by: Zhang Wei <zhangwei555@huawei.com>
Upstream-commit: 894266c1bbdfeb53bf278f3cb762945bac69e592
Component: engine

components/engine/api/client/pause.go

@@ -20,7 +20,7 @@ func (cli *DockerCli) CmdPause(args ...string) error {
 	var errs []string
 	for _, name := range cmd.Args() {
 		if err := cli.client.ContainerPause(name); err != nil {
-			errs = append(errs, fmt.Sprintf("Failed to pause container (%s): %s", name, err))
+			errs = append(errs, err.Error())
 		} else {
 			fmt.Fprintf(cli.out, "%s\n", name)
 		}