move dependencies to vendor

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

@@ -0,0 +1,13 @@
+// +build !go1.4
+
+package libcontainer
+
+import (
+	"fmt"
+	"syscall"
+)
+
+// not available before go 1.4
+func (c *linuxContainer) addUidGidMappings(sys *syscall.SysProcAttr) error {
+	return fmt.Errorf("User namespace is not supported in golang < 1.4")
+}