v4.0.0

• fixed issues with Openstack cloud credentials where it could not validate fields at terraform plan and ignored OS_* environment variables
• Openstack cloud credentials schema changed:
  For user credentials:
  before

openstack {
  username = ""
  password = ""
  project_id = ""
  project_name = ""
}

now

openstack {
  user_credentials {
    username = ""
    password = ""
    project_id = ""
    project_name = ""
 }
}

For Application Credentials
before

openstack {
  application_credentials_id = ""
  application_credentials_secret = ""
}

now

openstack {
  application_credentials {
    id = ""
    secret = ""
  }
}