LogDog: Add collector service implementation.

server/internal/logdog/config/doc.go

Index: server/internal/logdog/config/doc.go
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+// Copyright 2016 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.
+
+// Package config implements common LogDog daemon configuration.
+//
+// The majority of LogDog configuration is loaded from "luci-config". The
+// specific "luci-config" instance is passed to the daemon by the LogDog
+// Coordaintor service. This library implements the logic to pull the
+// configuration paramerers, load the "luci-config" configuration, and expose it
+// to the service daemon.
+//
+// Additionally, for testing, an option is implemented that allows the user to
+// read the configuration from a local file (as a text protobuf) instead of
+// from the Coordinator.
+package config