title: Handling Openstack provider credentials in Terraform without vault
body: <p>Is there any option available for handling Openstack provider credentials in Terraform similar to the one exists in AWS provider like <strong>Environment variables</strong>. </p>
  
  <p><strong>My Usecase:</strong></p>
  
  <p>As part of the POC, I would be invoking the <code>terraform apply</code> command from my python app in which I am planning to define the Openstack credentials as environment variables and unset the same once execution completed.  By this I can avoid storing the credentials in files as well the vault/consul complexity. </p>
  
  <p>Please clarify, thanks. </p>