A failure to get the IAuthGraphKeyExchange/nonsecure instance might
be because it's not registered (likely on most non-Cuttlefish devices)
or it might be for some other reason, such as SELinux denial.
So detect other kinds of failure to get the service, and also change
the VTS to require root so SELinux denials don't happen.
Also tweak the expected return code when a source is given a corrupt
key; now that replay protection is implemented, the reference
implementation rejects this earlier (and with a different error)
because the session lookup fails.
Test: VtsAidlAuthGraphRoleTest
Bug: 291228560
Change-Id: I032600ac809f43a3642fa9ef9aae788d3ca2378f
Add VTS tests that just exercise a single role, sink or source.
Use the AuthGraph core library to provide the implementation of the
other role. This means that the tests are best written in Rust.
Put the test code into a library, so that other HALs which include
AuthGraph as a component can exercise the AuthGraph parts in their own
VTS tests.
Test: VtsAidlAuthGraphRoleTest
Bug: 284470121
Change-Id: I73f6aa277b41cc728587d707d7a6f82f0d18e08f
