[reachability] Improve gateway health explicitness

Being explicit about gateways that have never been observed as healthy
exposed a potential watchdog failing if there's a gateway that is
observed to never be healthy. Fix that case and add a test.

Bug: 118055

Change-Id: I7dee8682c074cb0359a670d141a84a77da9a552c
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/779978
Reviewed-by: Evan Wildenhain <wildenhain@google.com>
Fuchsia-Auto-Submit: Bruno Dal Bo <brunodalbo@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
1 file changed
tree: 35cb2486e55950b690c9a928e89b469334564568
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. products/
  7. scripts/
  8. sdk/
  9. src/
  10. third_party/
  11. tools/
  12. zircon/
  13. .clang-format
  14. .clang-tidy
  15. .editorconfig
  16. .git-blame-ignore-revs
  17. .gitattributes
  18. .gitignore
  19. .gitmodules
  20. .gn
  21. .style.yapf
  22. analysis_options.yaml
  23. AUTHORS
  24. BUILD.gn
  25. CODE_OF_CONDUCT.md
  26. CONTRIBUTING.md
  27. fuchsia.code-workspace
  28. LICENSE
  29. OWNERS
  30. PATENTS
  31. pyrightconfig.json
  32. README.md
  33. rustfmt.toml
README.md

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