* changed collection arg to argregate on 2.4 network modules
* replace users with aggregate in eos_user, junos_user, nxos_user
* added version_added to places where we replaced users with aggregate in the docs
* fix ios_static_route test
* update tests to reference aggregate instead of collection/users
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.
