<doc>[readme]: fix links in README.md with https

Change-Id: I75697474666772786c796a757a736d7170786577

README.md

@@ -1,4 +1,4 @@
-# ZStack: the IaaS software you have been looking for. [http://zstack.org](http://zstack.org)
+# ZStack: the IaaS software you have been looking for. [https://zstack.org](https://zstack.org)
 
 ZStack is open source IaaS(infrastructure as a service) software aiming to automate datacenters, managing resources of compute, storage,
 and networking all by APIs. Users can setup ZStack environments in a download-and-run manner, spending 5 minutes building a POC environment
@@ -115,15 +115,15 @@ ZStack environment:
 
 * For users wanting to try out quickly, see [Quick Installation](https://www.zstack-cloud.com/help/en/tutorials/quick_install_guide/v4/).
 
-* For users wanting to deploy a production environment, see [Manual Installation](http://zstack.org/installation/manual.html).
+* For users wanting to deploy a production environment, see [Manual Installation](https://zstack.org/installation/manual.html).
 
 * For users wanting to deploy a multi-node environment, see [Multi-node Installation](https://www.zstack-cloud.com/help/en/tutorials/double_mn_ha_solution/v4/).
 
 Once the installation is done, users can follow one of getting started guides:
 
 * [Getting Started With Quick Installation](https://www.zstack-cloud.com/help/en/tutorials/quick_install_guide/v4/3.html).
 
-* [Getting Started With Manual Installation](http://zstack.org/documentation/getstart-manual.html).
+* [Getting Started With Manual Installation](https://zstack.org/documentation/getstart-manual.html).
 
 * [Getting Started With Multi-node Installation](https://www.zstack-cloud.com/help/en/tutorials/double_mn_ha_solution/v4/2.html).
 
@@ -134,80 +134,80 @@ Six tutorials are prepared for your first journey in ZStack, building classic cl
 ##### Elastic IP:
 
 * [Web UI](https://www.zstack-cloud.com/help/en/tutorials/vpc_tutorial/v4/3.html#chapter-3-7-Elastic-IP)
-* [Command Line Tool](http://zstack.org/tutorials/ec2-cli.html)
+* [Command Line Tool](https://zstack.org/tutorials/ec2-cli.html)
 
 ##### Flat Network:
 
 * [Web UI](https://www.zstack-cloud.com/help/en/tutorials/flat_tutorial/v4/)
-* [Command Line Tool](http://zstack.org/tutorials/flat-network-cli.html)
+* [Command Line Tool](https://zstack.org/tutorials/flat-network-cli.html)
 
 ##### Three Tiered Network:
 
-* [Web UI](http://zstack.org/tutorials/three-tiered-ui.html)
-* [Command Line Tool](http://zstack.org/tutorials/three-tiered-cli.html)
+* [Web UI](https://zstack.org/tutorials/three-tiered-ui.html)
+* [Command Line Tool](https://zstack.org/tutorials/three-tiered-cli.html)
 
 ##### Security Group:
 
 * [Web UI](https://www.zstack-cloud.com/help/en/tutorials/vpc_tutorial/v4/3.html#chapter-3-6-Security-Group)
-* [Command Line Tool](http://zstack.org/tutorials/security-group-cli.html)
+* [Command Line Tool](https://zstack.org/tutorials/security-group-cli.html)
 
 ##### Port Forwarding:
 
 * [Web UI](https://www.zstack-cloud.com/help/en/tutorials/vpc_tutorial/v4/3.html#chapter-3-8-Port-Forwarding)
-* [Command Line Tool](http://zstack.org/tutorials/elastic-port-forwarding-cli.html)
+* [Command Line Tool](https://zstack.org/tutorials/elastic-port-forwarding-cli.html)
 
 ##### Snapshots:
 
 * [Web UI](https://www-zstack-io.translate.goog/help/tutorials/volume_snapshot_tutorial/v4/1.html?_x_tr_sl=zh-CN&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp)
-* [Command Line Tool](http://zstack.org/tutorials/snapshot-cli.html)
+* [Command Line Tool](https://zstack.org/tutorials/snapshot-cli.html)
 
 ## Under the hood 
 
 Under the hood, ZStack is built on an architecture explained by following articles:
 
 ##### Scalability:
 
-[ZStack's Scalability Secrets Part 1: Asynchronous Architecture](http://zstack.org/blog/asynchronous-architecture.html)
+[ZStack's Scalability Secrets Part 1: Asynchronous Architecture](https://zstack.org/blog/asynchronous-architecture.html)
 
-[ZStack's Scalability Secrets Part 2: Stateless Services](http://zstack.org/blog/stateless-clustering.html)
+[ZStack's Scalability Secrets Part 2: Stateless Services](https://zstack.org/blog/stateless-clustering.html)
 
-[ZStack's Scalability Secrets Part 3: Lock-free Architecture](http://zstack.org/blog/lock-free.html)
+[ZStack's Scalability Secrets Part 3: Lock-free Architecture](https://zstack.org/blog/lock-free.html)
 
 ##### Plugin Architecture:
 
-[The In-Process Microservices Architecture](http://zstack.org/blog/microservices.html)
+[The In-Process Microservices Architecture](https://zstack.org/blog/microservices.html)
 
-[The Versatile Plugin System](http://zstack.org/blog/plugin.html)
+[The Versatile Plugin System](https://zstack.org/blog/plugin.html)
 
-[The Tag System](http://zstack.org/blog/tag.html)
+[The Tag System](https://zstack.org/blog/tag.html)
 
-[The Workflow Engine](http://zstack.org/blog/workflow.html)
+[The Workflow Engine](https://zstack.org/blog/workflow.html)
 
-[The Cascade Framework](http://zstack.org/blog/cascade.html)
+[The Cascade Framework](https://zstack.org/blog/cascade.html)
 
 ##### Query API:
 
-[The Query API](http://zstack.org/blog/query.html)
+[The Query API](https://zstack.org/blog/query.html)
 
 ##### Automation:
 
-[Full Automation By Ansible](http://zstack.org/blog/ansible.html)
+[Full Automation By Ansible](https://zstack.org/blog/ansible.html)
 
 ##### Storage And Network:
 
-[Networking Model 1: L2 and L3 Network](http://zstack.org/blog/network-l2.html)
+[Networking Model 1: L2 and L3 Network](https://zstack.org/blog/network-l2.html)
 
-[Networking Model 2: Virtual Router Network Service Provider](http://zstack.org/blog/virtual-router.html)
+[Networking Model 2: Virtual Router Network Service Provider](https://zstack.org/blog/virtual-router.html)
 
-[Storage Model: Primary Storage and Backup Storage](http://zstack.org/blog/storage.html)
+[Storage Model: Primary Storage and Backup Storage](https://zstack.org/blog/storage.html)
 
 ##### Testing:
 
-[The Automation Testing System 1: Integration Testing](http://zstack.org/blog/integration-testing.html)
+[The Automation Testing System 1: Integration Testing](https://zstack.org/blog/integration-testing.html)
 
-[The Automation Testing System 2: System Testing](http://zstack.org/blog/system-testing.html)
+[The Automation Testing System 2: System Testing](https://zstack.org/blog/system-testing.html)
 
-[The Automation Testing System 3: Model-based Testing](http://zstack.org/blog/model-based-testing.html)
+[The Automation Testing System 3: Model-based Testing](https://zstack.org/blog/model-based-testing.html)
 
 ## More Documentation Resources
 
@@ -218,7 +218,7 @@ Under the hood, ZStack is built on an architecture explained by following articl
 Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
 except in compliance with the License. You may obtain a copy of the License at
 
-http://www.apache.org/licenses/LICENSE-2.0
+https://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software distributed under the License is
 distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.