add sub command line for migrating

[carlvine500]

there are lots of redis data that will migrate from aws to aliyun, we expect to add some sub commands instead of toml config .
我们有大量的redis从aws迁移到国内云厂商, 如果书写大量的配置文件会有些繁琐, 期望能直接使用子命令的方式做数据转移:

./redis-shake rdb_reader -f /usr/local/src/10.53.0.10/6379/dump.rdb redis_writer -a 172.38.100.66:6379 advanced --ncpu 1
./redis-shake rdb_reader -f /usr/local/src/10.53.0.11/6379/dump.rdb redis_writer -a 172.38.100.67:6379 advanced --ncpu 1
./redis-shake rdb_reader -f /usr/local/src/10.53.0.12/6379/dump.rdb redis_writer -a 172.38.100.68:6379 advanced --ncpu 1