Vendor containerd 2386062 and runtime-tools e29f3ca.

Signed-off-by: Lantao Liu <lantaol@google.com>

vendor/github.com/opencontainers/runtime-spec/specs-go/state.go

@@ -9,7 +9,7 @@ type State struct {
 	// Status is the runtime status of the container.
 	Status string `json:"status"`
 	// Pid is the process ID for the container process.
-	Pid int `json:"pid"`
+	Pid int `json:"pid,omitempty"`
 	// Bundle is the path to the container's bundle directory.
 	Bundle string `json:"bundle"`
 	// Annotations are key values associated with the container.