Reject non-ASCII hostnames and SANs. am: 650e71cc3a am: cad6f31431

Original change: https://googleplex-android-review.googlesource.com/c/platform/libcore/+/13163680

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I06720828da12fd1aea7cfaa802a0794e51bc24d5