Fix buck test in Gerrit tree

Running tests in Gerrit tree:
    buck test --include websesson-flatfile
was failing because of lacking dependencies.

Add GERRIT_TESTS to list of test dependencies.

Change-Id: I18ab5c102737f9c4eef314d6f91ad8377fbd00ae
2 files changed
tree: a10268109365c89028de9385ee600b36c3f8a077
  1. .buckconfig
  2. .gitignore
  3. .settings/
  4. BUCK
  5. LICENSE
  6. lib/
  7. src/