[BUG] 内存中的key没有持久化到rocksdb

[safuel0759]

复现步骤：
1、使用redis-shake通过restore rdb file导入key
2、导入完成后执行info keyspace查看key信息，直到evicts值不再增加
#Keyspace
db0:keys=34897,evicts=142868,metas=0,expires=0,avg_ttl=0
3、shutdown save
4、重新启动xredis-ror
5、执行info keyspace查看key信息
#Keyspace
db0:keys=0,evicts=142868,metas=0,expires=0,avg_ttl=0

redis.conf参数
######################
swap-mode disk
swap-threads 4
swap-max-db-size 0
swap-evict-inprogress-growth-rate 5mb
swap-evict-inprogress-limit 128
swap-evict-step-max-subkeys 1024
swap-evict-step-max-memory 1mb
swap-ratelimit-policy pause
swap-ratelimit-maxmemory-percentage 200
swap-persist-enabled yes
swap-ratelimit-maxmemory-pause-growth-rate 20mb
#####################
gtid-enable yes
gtid-enabled-config-sync-with-master yes
gtid-uuid-gap-max-memory 10mb