cloudcommon: options: add constants for lock method

pkg/cloudcommon/database.go

@@ -53,11 +53,11 @@ func InitDB(options *common_options.DBOptions) {
 	sqlchemy.SetDB(dbConn)
 
 	switch options.LockmanMethod {
-	case "inmemory", "":
+	case common_options.LockMethodInMemory, "":
 		log.Infof("using inmemory lockman")
 		lm := lockman.NewInMemoryLockManager()
 		lockman.Init(lm)
-	case "etcd":
+	case common_options.LockMethodEtcd:
 		log.Infof("using etcd lockman")
 		tlsCfg, err := options.GetEtcdTLSConfig()
 		if err != nil {

pkg/cloudcommon/options/options.go

@@ -89,6 +89,11 @@ type BaseOptions struct {
 	structarg.BaseOptions
 }
 
+const (
+	LockMethodInMemory = "inmemory"
+	LockMethodEtcd     = "etcd"
+)
+
 type CommonOptions struct {
 	AuthURL            string `help:"Keystone auth URL" alias:"auth-uri"`
 	AdminUser          string `help:"Admin username"`