fix command info keyspace off

Use docker multi-stage build to reduce the docker image size

update the way to update git submodule

delete debug log in pika_command.cc

ThreadModle done.
TODO redis response parser, redis command builder.

* Add area_block_size and max_write_buffer_number configs

* Config related commands can modify mutable options for storage engine

* feature: support hashtag in sharding mode

* feature: pkscanrange and pkrscanrange support hashtag in non classic
mode

* feature: rpoplpush support hashtag

bugfix: crc32 slot distribute algorithm error with non 2 power slot number

bugfix: can't sync binlog when exec redis command setnx and the key was exist.
when exec cmd setnx, if the key was exist, the value was not update by this cmd.
the binlog of this cmd will be saved into binlog file, but binlog length was zero. so can't do sync log.
so i fixed this issue, by writing binlog of setnx not judge from command return value.