Add CTS for NetworkAgentConfig#setSubscriberId

Ignore-AOSP-First: Needs cherry-picks
Test: atest CtsNetTestCases:android.net.cts.NetworkAgentTest
Test: atest CtsNetTestCasesLatestSdk:android.net.cts.NetworkAgentTest
      on R device
Bug: 188140631
Change-Id: I90d47ac9bd0570c0aed19402fa9be4e99e0f8621
1 file changed
tree: 1474beca6d11dc1da2d49dd5729a33edcd6e78f3
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING