Change API from 'Google API Client' to 'Google Cloud Python Client' (#…

…723)

* Document how to use Google's credentials associated with a user acccount

Signed-off-by: Pablo Méndez Hernández <[email protected]>

* Change API from 'Google API Client' to 'Google Cloud Python Client'

According to the 'Google API Client' GH page:

```
This library is considered complete and is in maintenance mode. This means
that we will address critical bugs and security issues but will not add any
new features.

This library is officially supported by Google. However, the maintainers of
this repository recommend using Cloud Client Libraries for Python, where
possible, for new code development.
```

So change the code accordingly to adapt it to 'Google Cloud Python Client'.

Signed-off-by: Pablo Méndez Hernández <[email protected]>

---------

Signed-off-by: Pablo Méndez Hernández <[email protected]>

docs/cloud_setup.md

@@ -13,13 +13,26 @@ Supported Cloud Providers:
 **NOTE**: For clusters with AWS make sure [AWS CLI](https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html) is installed and properly [configured](https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-quickstart.html) using an AWS account
 
 ## GCP
-**NOTE**: For clusters with GCP make sure [GCP CLI](https://cloud.google.com/sdk/docs/install#linux) is installed.
 
-A google service account is required to give proper authentication to GCP for node actions. See [here](https://cloud.google.com/docs/authentication/getting-started) for how to create a service account.
+In order to set up Application Default Credentials (ADC) for use by Cloud Client Libraries, you can provide either service account credentials or the credentials associated with your user acccount:
 
-**NOTE**: A user with 'resourcemanager.projects.setIamPolicy' permission is required to grant project-level permissions to the service account.
+- Using service account credentials:
 
-After creating the service account you will need to enable the account using the following: ```export GOOGLE_APPLICATION_CREDENTIALS="<serviceaccount.json>"```
+  A google service account is required to give proper authentication to GCP for node actions. See [here](https://cloud.google.com/docs/authentication/getting-started) for how to create a service account.
+
+  **NOTE**: A user with 'resourcemanager.projects.setIamPolicy' permission is required to grant project-level permissions to the service account.
+
+  After creating the service account you will need to enable the account using the following: ```export GOOGLE_APPLICATION_CREDENTIALS="<serviceaccount.json>"```
+
+- Using the credentials associated with your user acccount:
+
+  1. Make sure that the [GCP CLI](https://cloud.google.com/sdk/docs/install#linux) is installed and [initialized](https://cloud.google.com/sdk/docs/initializing) by running:
+
+     ```gcloud init```
+
+  2. Create local authentication credentials for your user account:
+
+     ```gcloud auth application-default login```
 
 ## Openstack
 
@@ -32,6 +45,7 @@ After creating the service account you will need to enable the account using the
 To properly run the service principal requires “Azure Active Directory Graph/Application.ReadWrite.OwnedBy” api permission granted and “User Access Administrator”.
 
 Before running you will need to set the following:
+
 1. ```export AZURE_SUBSCRIPTION_ID=<subscription_id>```
 
 2. ```export AZURE_TENANT_ID=<tenant_id>```
@@ -66,9 +80,10 @@ Set the following environment variables
 
 These are the credentials that you would normally use to access the vSphere client.
 
-
 ## IBMCloud
-If no api key is set up with proper VPC resource permissions, use the following to create: 
+
+If no API key is set up with proper VPC resource permissions, use the following to create it:
+
 * Access group
 * Service id with the following access
   * With policy **VPC Infrastructure Services**