cli: remove unused Errors type

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

cli/error.go

@@ -2,26 +2,8 @@ package cli // import "github.com/docker/docker/cli"
 
 import (
 	"fmt"
-	"strings"
 )
 
-// Errors is a list of errors.
-// Useful in a loop if you don't want to return the error right away and you want to display after the loop,
-// all the errors that happened during the loop.
-type Errors []error
-
-func (errList Errors) Error() string {
-	if len(errList) < 1 {
-		return ""
-	}
-
-	out := make([]string, len(errList))
-	for i := range errList {
-		out[i] = errList[i].Error()
-	}
-	return strings.Join(out, ", ")
-}
-
 // StatusError reports an unsuccessful exit by a command.
 type StatusError struct {
 	Status     string