move dependencies to vendor

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

@@ -0,0 +1,26 @@
+// +build go1.4
+
+package libcontainer
+
+import "syscall"
+
+// Converts IDMap to SysProcIDMap array and adds it to SysProcAttr.
+func (c *linuxContainer) addUidGidMappings(sys *syscall.SysProcAttr) error {
+	if c.config.UidMappings != nil {
+		sys.UidMappings = make([]syscall.SysProcIDMap, len(c.config.UidMappings))
+		for i, um := range c.config.UidMappings {
+			sys.UidMappings[i].ContainerID = um.ContainerID
+			sys.UidMappings[i].HostID = um.HostID
+			sys.UidMappings[i].Size = um.Size
+		}
+	}
+	if c.config.GidMappings != nil {
+		sys.GidMappings = make([]syscall.SysProcIDMap, len(c.config.GidMappings))
+		for i, gm := range c.config.GidMappings {
+			sys.GidMappings[i].ContainerID = gm.ContainerID
+			sys.GidMappings[i].HostID = gm.HostID
+			sys.GidMappings[i].Size = gm.Size
+		}
+	}
+	return nil
+}