add kvrocks

[kokizzu]

A distributed key value NoSQL database that uses RocksDB as storage engine and is compatible with Redis protocol.

Kvrocks has the following key features:

• Redis protocol, user can use Redis client to visit the kvrocks
• Namespace, similar to Redis DB but use token per namespace
• Replication, async replication using binlog like MySQL
• High Available, supports Redis sentinel to failover when master or slave was failed