LogDog: Add prefix registration endpoint.

common/api/logdog_coordinator/registration/v1/util.go

Index: common/api/logdog_coordinator/registration/v1/util.go
diff --git a/common/proto/logdog/svcconfig/util.go b/common/api/logdog_coordinator/registration/v1/util.go
similarity index 52%
copy from common/proto/logdog/svcconfig/util.go
copy to common/api/logdog_coordinator/registration/v1/util.go
index 4254565e49db2a521cc3e04c0bbf31bcf9e00038..1707be75f9168502e5b495f6294901a79ec81ff9 100644
--- a/common/proto/logdog/svcconfig/util.go
+++ b/common/api/logdog_coordinator/registration/v1/util.go
@@ -2,9 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package svcconfig
+package logdog
 
-const (
-	// ServiceConfigFilename is the config service path of the Config protobuf.
-	ServiceConfigFilename = "services.cfg"
-)
+// GetMessageProject implements ProjectBoundMessage.
+func (req *RegisterPrefixRequest) GetMessageProject() string { return req.Project }