retire shade in favor of openstacksdk for openstack modules (#40532)

* Establish connection through openstacksdk
* Switch from shade to openstacksdk
* fix typo in link to openstacksdk
* remove nova_client usage
* further remove of min_version from openstack modules

lib/ansible/modules/cloud/openstack/os_user_role.py

@@ -53,7 +53,7 @@ options:
        - Ignored. Present for backwards compatibility
 requirements:
     - "python >= 2.6"
-    - "shade"
+    - "openstacksdk"
 '''
 
 EXAMPLES = '''
@@ -127,9 +127,7 @@ def main():
     domain = module.params.get('domain')
     state = module.params.get('state')
 
-    # role grant/revoke API introduced in 1.5.0
-    shade, cloud = openstack_cloud_from_module(
-        module, min_version='1.5.0')
+    sdk, cloud = openstack_cloud_from_module(module)
     try:
         filters = {}
 
@@ -184,7 +182,7 @@ def main():
 
         module.exit_json(changed=changed)
 
-    except shade.OpenStackCloudException as e:
+    except sdk.exceptions.OpenStackCloudException as e:
         module.fail_json(msg=str(e))