Add RegistryLock SQL schema (#243)

* Add RegistryLock SQL schema

* Refactor a bit

* Move registrylock -> domain

* Clearing up lock workflow

* Add more docs and remove LockStatus

* Responses to CR

* Add repoId javadoc

* Add registry lock to persistence xml file

* Quote rather than backtick

* Remove unnecessary check

* File TODO

* Remove uniqueness constraint on verification code

* Remove import

* add index

* Add to SQL generation task

* Move fields around to be the same order as Hibernate's generated sql

db/src/main/resources/sql/schema/registry_lock.sql

@@ -0,0 +1,30 @@
+-- Copyright 2019 The Nomulus Authors. All Rights Reserved.
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+CREATE TABLE "RegistryLock" (
+  revision_id BIGSERIAL NOT NULL,
+  action TEXT NOT NULL,
+  completion_timestamp TIMESTAMPTZ,
+  creation_timestamp TIMESTAMPTZ NOT NULL,
+  domain_name TEXT NOT NULL,
+  is_superuser BOOLEAN NOT NULL,
+  registrar_id TEXT NOT NULL,
+  registrar_poc_id TEXT,
+  repo_id TEXT NOT NULL,
+  verification_code TEXT NOT NULL,
+  PRIMARY KEY (revision_id)
+);
+
+ALTER TABLE IF EXISTS "RegistryLock"
+  ADD CONSTRAINT idx_registry_lock_repo_id_revision_id UNIQUE (repo_id, revision_id);