Integrate new structure into docker's native driver

This duplicates some of the Exec code but I think it it worth it because
the native driver is more straight forward and does not have the
complexity have handling the type issues for now.
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)

libcontainer/nsinit/unsupported.go

@@ -3,9 +3,22 @@
 package nsinit
 
 import (
+	"github.com/dotcloud/docker/pkg/cgroups"
 	"github.com/dotcloud/docker/pkg/libcontainer"
 )
 
+func Init(container *libcontainer.Container, uncleanRootfs, consolePath string, syncPipe *SyncPipe, args []string) error {
+	return libcontainer.ErrUnsupported
+}
+
+func InitializeNetworking(container *libcontainer.Container, nspid int, pipe *SyncPipe) error {
+	return libcontainer.ErrUnsupported
+}
+
+func SetupCgroups(container *libcontainer.Container, nspid int) (cgroups.ActiveCgroup, error) {
+	return nil, libcontainer.ErrUnsupported
+}
+
 func GetNamespaceFlags(namespaces libcontainer.Namespaces) (flag int) {
 	return 0
 }