alibabacloud: use NextToken and MaxResults to list instance types

Currently, there is no paging query used to retrieve instance types.
When there are many instance types, some instances can not obtain ENI
and IPPerENI limits. The cilium operator log is as follows.
```
level=warning msg="Unable to maintain ip pool of node" error="Unable
to determine limits" instanceID=<ID> name=<NAME> subsys=ipam
```
This patch fixes this problem by using NextToken and MaxResults for
paging query.

Signed-off-by: Hao Zhang <hao.zhang.am.i@gmail.com>

pkg/alibabacloud/api/api.go

@@ -182,13 +182,30 @@ func (c *Client) GetVPCs(ctx context.Context) (ipamTypes.VirtualNetworkMap, erro
 
 // GetInstanceTypes returns all the known ECS instance types in the configured region
 func (c *Client) GetInstanceTypes(ctx context.Context) ([]ecs.InstanceType, error) {
+	var result []ecs.InstanceType
 	req := ecs.CreateDescribeInstanceTypesRequest()
-	resp, err := c.ecsClient.DescribeInstanceTypes(req)
-	if err != nil {
-		return nil, err
+	// When there are many instance types, some instance limits can not be queried,
+	// so use NextToken and MaxResults for paging query.
+	// MaxResults is the number of entries on each page, the maximum value of this parameter is 100.
+	// Ref: https://www.alibabacloud.com/help/en/elastic-compute-service/latest/describeinstancetypes
+	req.MaxResults = requests.NewInteger(100)
+	for {
+		resp, err := c.ecsClient.DescribeInstanceTypes(req)
+		if err != nil {
+			return nil, err
+		}
+
+		for _, v := range resp.InstanceTypes.InstanceType {
+			result = append(result, v)
+		}
+
+		if resp.NextToken == "" {
+			break
+		}
+		req.NextToken = resp.NextToken
 	}
 
-	return resp.InstanceTypes.InstanceType, nil
+	return result, nil
 }
 
 // GetSecurityGroups return all sg