[AGW + Orc8r] Replace subscriberDB streaming when EPS authentication service is active

[ssanadhya]

In order to address #12907, #13048 adds logic to enable EPS authentication service in Orc8r whenever the CloudSubscriberdbEnabled flag is set to true.

When EPS authentication service is enabled, the Orc8r needs to stop streaming subscriber information to Subscriberdb on AGW. As part of this change, the APN specific configs, such as static IP address(es), vlan-id, etc, which are needed by Mobilityd on AGW will not be streamed.

This issue tracks the steps needed to make the config available to Mobilityd when EPS authentication service is used for authentication instead of AGW's SubscriberDB. Specifically,

• [AGW + Orc8r] Share APN specific per-UE config using S6a ULA #13250
• [Orc8r] Populate ULA from EPS Authentication Service with APN specific config #13267
• [AGW] Write per subscriber APN specific data into subscriberDB store when MME receives Update Location Answer #13252 fixed in feat(agw): Write per subscriber APN specific data into subscriberDB store when MME receives Update Location Answer #13470
• [orc8r] Turn off subscriber data streaming from Orc8r when CloudSubscriberdbEnabled is set to true #13251
• [AGW + Orc8r] Finalize EPS authentication flow: Document the feature, add integration tests #14396

[lucasgonze]

This got bogged down when Varun left. The remaining work needs an owner.

Only remaining tasks are adding:

• integration tests for CI
• documentation

[sebathomas]

@ssanadhya

Do we have some more information about the content of the changes that needs to be documented? Is everything in this ticket, the linked security issue, and the linked PRs?

Also, which features should be tested? I assume this would need to be a federated integration test since it involves AGW and Orc8r?

[sebathomas]

It looks like #13252 and #13251 are not done but were closed by the stalebot. So there is probably more left to do than writing tests and documentation.

[lucasgonze]

@sebathomas are you comfortable owning #13251?

[sebathomas]

Yes, we'll estimate it in the team tomorrow.

[sebathomas]

And I added another subtask for documentation + tests.