Bump cadvisor dependencies to latest head.

vendor/github.com/opencontainers/runc/libcontainer/generic_error.go

@@ -1,7 +1,6 @@
 package libcontainer
 
 import (
-	"fmt"
 	"io"
 	"text/template"
 	"time"
@@ -52,21 +51,6 @@ func newGenericError(err error, c ErrorCode) Error {
 }
 
 func newSystemError(err error) Error {
-	return createSystemError(err, "")
-}
-
-func newSystemErrorWithCausef(err error, cause string, v ...interface{}) Error {
-	return createSystemError(err, fmt.Sprintf(cause, v...))
-}
-
-func newSystemErrorWithCause(err error, cause string) Error {
-	return createSystemError(err, cause)
-}
-
-// createSystemError creates the specified error with the correct number of
-// stack frames skipped. This is only to be called by the other functions for
-// formatting the error.
-func createSystemError(err error, cause string) Error {
 	if le, ok := err.(Error); ok {
 		return le
 	}
@@ -74,8 +58,7 @@ func createSystemError(err error, cause string) Error {
 		Timestamp: time.Now(),
 		Err:       err,
 		ECode:     SystemError,
-		Cause:     cause,
-		Stack:     stacktrace.Capture(2),
+		Stack:     stacktrace.Capture(1),
 	}
 	if err != nil {
 		gerr.Message = err.Error()
@@ -87,17 +70,12 @@ type genericError struct {
 	Timestamp time.Time
 	ECode     ErrorCode
 	Err       error `json:"-"`
-	Cause     string
 	Message   string
 	Stack     stacktrace.Stacktrace
 }
 
 func (e *genericError) Error() string {
-	if e.Cause == "" {
-		return e.Message
-	}
-	frame := e.Stack.Frames[0]
-	return fmt.Sprintf("%s:%d: %s caused %q", frame.File, frame.Line, e.Cause, e.Message)
+	return e.Message
 }
 
 func (e *genericError) Code() ErrorCode {