Remove unused runc files

We no longer use runc code to read network I/O usage. This lets
us remove a lot of vendored code.

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

Closes: #425
Approved by: rhatdan

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs/name.go

@@ -1,40 +0,0 @@
-// +build linux
-
-package fs
-
-import (
-	"github.com/opencontainers/runc/libcontainer/cgroups"
-	"github.com/opencontainers/runc/libcontainer/configs"
-)
-
-type NameGroup struct {
-	GroupName string
-	Join      bool
-}
-
-func (s *NameGroup) Name() string {
-	return s.GroupName
-}
-
-func (s *NameGroup) Apply(d *cgroupData) error {
-	if s.Join {
-		// ignore errors if the named cgroup does not exist
-		d.join(s.GroupName)
-	}
-	return nil
-}
-
-func (s *NameGroup) Set(path string, cgroup *configs.Cgroup) error {
-	return nil
-}
-
-func (s *NameGroup) Remove(d *cgroupData) error {
-	if s.Join {
-		removePath(d.path(s.GroupName))
-	}
-	return nil
-}
-
-func (s *NameGroup) GetStats(path string, stats *cgroups.Stats) error {
-	return nil
-}