luci: restore luci-logdog-dev.cfg.

Currently, luci-logdog-dev isn't letting anything write to project
chromium.

Bug: 868525
Change-Id: I970ccc0b6959f3d5830ca007df963a6edaf6693a
Reviewed-on: https://chromium-review.googlesource.com/1176079Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583301}

infra/config/global/luci-logdog-dev.cfg

+# Copyright (c) 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# For the schema of this file and documentation, see ProjectConfig message in
+# https://luci-config.appspot.com/schemas/projects:luci-logdog.cfg
+
+# Auth groups who can read log streams.
+reader_auth_groups: "all"
+# Auth groups who can register and emit new log streams.
+writer_auth_groups: "luci-logdog-chromium-dev-writers"
+
+# The base Google Storage archival path for this project.
+#
+# Archived LogDog logs will be written to this bucket/path.
+archive_gs_bucket: "chromium-luci-logdog"