Merge "Drop support for beta versions of Android T." am: 3611d6d1aa

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2563510

Change-Id: If0c1ae9163a65214ad83f532271a45eea8dc8ee2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>