[tools] Replace deprecated ioutil methods ioutil was deprecated in Go 1.16. This change modifies tools/ to use the new functions. Bug: b/235863442 Change-Id: I6bcbe2a7133d8e3656ba8c3a59b2acc6da172044 Reviewed-on: https://fuchsia-review.googlesource.com/c/tools/+/712402 Fuchsia-Auto-Submit: Chris Lewis <cflewis@google.com> Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com> Reviewed-by: Yuping Zhai <yupingz@google.com>
All tools have been moved to fuchsia.git at https://fuchsia.googlesource.com/fuchsia/+/refs/heads/master/tools.