fix(test/remove_node_test.go) fix a deadlock in the test

The go-etcd client waits for the response from the paused node. And the test waits for the reponse to continue.
Actually we do not even need that small test, since we will check the machine status afterwards.

tests/functional/remove_node_test.go

@@ -185,20 +185,8 @@ func TestRemovePausedNode(t *testing.T) {
 
 		etcds[idx].Signal(syscall.SIGSTOP)
 		fmt.Printf("pause node%d and let standby node take its place\n", idx+1)
-		time.Sleep(4 * time.Second)
 
-		resp, err := c.Get("_etcd/machines", false, false)
-		if err != nil {
-			panic(err)
-		}
-		if len(resp.Node.Nodes) != 3 {
-			t.Fatal("cannot remove peer")
-		}
-		for i := 0; i < 3; i++ {
-			if resp.Node.Nodes[i].Key == fmt.Sprintf("node%d", idx+1) {
-				t.Fatal("node should be removed")
-			}
-		}
+		time.Sleep(4 * time.Second)
 
 		etcds[idx].Signal(syscall.SIGCONT)
 		// let it change its state to candidate at least