Support for PPP without authentication

[nward]

Is your feature request related to a problem? Please describe.

Some BNG configurations don't request PPP authentication, and relying on agent-circuit-id and agent-remote-id. BNG blaster does not operate if authentication is not configured. If it is configured, but not negotiated, it does not bring up the session and just constantly tries to request authentication to be negotiated.

Describe the solution you'd like

Two options, maybe both:

• Support client configurations which do not have authentication
• Allow clients to come up when a BNG does not negotiate authentication

Describe alternatives you've considered

We can change the BNG configuration in some cases to use a default username/password - however this is a functional change to the BNG so is not ideal for testing.

Additional context

n/a