Update vendor dependencies

Signed-off-by: Emile Vauge <emile@vauge.com>

vendor/github.com/opencontainers/runc/libcontainer/system/proc.go

@@ -1,27 +0,0 @@
-package system
-
-import (
-	"io/ioutil"
-	"path/filepath"
-	"strconv"
-	"strings"
-)
-
-// look in /proc to find the process start time so that we can verify
-// that this pid has started after ourself
-func GetProcessStartTime(pid int) (string, error) {
-	data, err := ioutil.ReadFile(filepath.Join("/proc", strconv.Itoa(pid), "stat"))
-	if err != nil {
-		return "", err
-	}
-
-	parts := strings.Split(string(data), " ")
-	// the starttime is located at pos 22
-	// from the man page
-	//
-	// starttime %llu (was %lu before Linux 2.6)
-	// (22)  The  time the process started after system boot.  In kernels before Linux 2.6, this
-	// value was expressed in jiffies.  Since Linux 2.6, the value is expressed in  clock  ticks
-	// (divide by sysconf(_SC_CLK_TCK)).
-	return parts[22-1], nil // starts at 1
-}