实现全局锁在redis下的持久化, 完善 RedisRepository 的相关方法, 并编写相关测试用例。

[zkyoma]

Make sure that:

• [x] You have read the contribution guidelines.
• [x] You submit test cases (unit or integration tests) that back your changes.
• [x] Your local test passed mvn clean install -Dmaven.javadoc.skip=true.

for issue #353