Merge "Add nullability annotations to InetAddress APIs" am: 9d1a1a5d7f am: 3d37d4c8d7 am: 9a14e6ebb5

Original change: https://android-review.googlesource.com/c/platform/libcore/+/1657840

Change-Id: Ic60526d3ade58857abbadec87e5e3724e3477af8