logd: add tests for tail readers am: 0f7ec30b2c

Original change: https://android-review.googlesource.com/c/platform/system/logging/+/1502238

Change-Id: I5b408245eb0d07b464b0f5b281a7b61a7029810b
tree: e7e902e0fe83ef4d28ccb9f41371cb41815d9364
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/
  5. OWNERS
  6. PREUPLOAD.cfg
  7. TEST_MAPPING