Purge is not idempotent, so let's fix it with other change. For teardown, it's better to use eos_config/eos_command.
The 'admin' word was being masked by Ansible as potential cred. Let's just use network-operator since we are just testing here we can create users in aggregate.
Signed-off-by: Trishna Guha <trishnaguha17@gmail.com>