[Refactor] move BPF tests to BpfCoordinatorTest

Preparing for refactor of IpServer and BpfCoordinator. All BPF related
code are planned to migrate from IpServer to BpfCoordinator. This CL
moves BPF related tests from IpServerTest to BpfCoordinatorTest first.

Test: atest TetheringTests
Bug: 294025403
Change-Id: I000f27c463368202dbbe2ace188c8c5146669096
2 files changed