Prefer readthedocs.io instead of readthedocs.org for doc links (#41537)

Read the Docs moved hosting to readthedocs.io instead of
readthedocs.org. Fix all links in the project.

For additional details, see:

https://blog.readthedocs.com/securing-subdomains/

> Starting today, Read the Docs will start hosting projects from
> subdomains on the domain readthedocs.io, instead of on
> readthedocs.org. This change addresses some security concerns around
> site cookies while hosting user generated data on the same domain as
> our dashboard.

contrib/inventory/azure_rm.py

@@ -24,7 +24,7 @@ Azure External Inventory Script
 ===============================
 Generates dynamic inventory by making API requests to the Azure Resource
 Manager using the Azure Python SDK. For instruction on installing the
-Azure Python SDK see http://azure-sdk-for-python.readthedocs.org/
+Azure Python SDK see https://azure-sdk-for-python.readthedocs.io/
 
 Authentication
 --------------

contrib/inventory/consul_io.py

@@ -200,7 +200,7 @@ try:
     import consul
 except ImportError as e:
     sys.exit("""failed=True msg='python-consul required for this module.
-See http://python-consul.readthedocs.org/en/latest/#installation'""")
+See https://python-consul.readthedocs.io/en/latest/#installation'""")
 
 from six import iteritems
 

contrib/inventory/docker.py

@@ -32,7 +32,7 @@ script contacts can be defined using environment variables or a configuration fi
 Requirements
 ------------
 
-Using the docker modules requires having docker-py <https://docker-py.readthedocs.org/en/stable/>
+Using the docker modules requires having docker-py <https://docker-py.readthedocs.io/en/stable/>
 installed on the host running Ansible. To install docker-py:
 
    pip install docker-py

contrib/inventory/ec2.ini

@@ -196,7 +196,7 @@ stack_filters = False
 # iam_role = role-arn
 
 # A boto configuration profile may be used to separate out credentials
-# see http://boto.readthedocs.org/en/latest/boto_config_tut.html
+# see https://boto.readthedocs.io/en/latest/boto_config_tut.html
 # boto_profile = some-boto-profile-name
 
 

contrib/inventory/softlayer.py

@@ -6,7 +6,7 @@ The SoftLayer Python API client is required. Use `pip install softlayer` to inst
 You have a few different options for configuring your username and api_key. You can pass
 environment variables (SL_USERNAME and SL_API_KEY). You can also write INI file to
 ~/.softlayer or /etc/softlayer.conf. For more information see the SL API at:
-- https://softlayer-python.readthedocs.org/en/latest/config_file.html
+- https://softlayer-python.readthedocs.io/en/latest/config_file.html
 
 The SoftLayer Python client has a built in command for saving this configuration file
 via the command `sl config setup`.