Add REMOVE and ORPHANED to TaskState

This fix tries to address the issue raised in 36142 where
there are discrepancies between Swarm API and swagger.yaml.

This fix adds two recently added state `REMOVE` and `ORPHANED` to TaskState.

This fix fixes 36142.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

api/swagger.yaml

@@ -2804,6 +2804,8 @@ definitions:
       - "shutdown"
       - "failed"
       - "rejected"
+      - "remove"
+      - "orphaned"
 
   Task:
     type: "object"

api/types/swarm/task.go

@@ -36,6 +36,10 @@ const (
 	TaskStateFailed TaskState = "failed"
 	// TaskStateRejected REJECTED
 	TaskStateRejected TaskState = "rejected"
+	// TaskStateRemove REMOVE
+	TaskStateRemove TaskState = "remove"
+	// TaskStateOrphaned ORPHANED
+	TaskStateOrphaned TaskState = "orphaned"
 )
 
 // Task represents a task.