Read and expose universe_domain from service account JSON files in
CredentialsFromJSONWithParams to support TPC in 1p clients.
Change-Id: I3518a0ec8be5ff7235b946cffd88b26ac8d303cf
Reviewed-on: https://go-review.googlesource.com/c/oauth2/+/531715
Run-TryBot: Cody Oss <codyoss@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cody Oss <codyoss@google.com>
Chris Smith