fix(info): the slave lag in INFO command might be overflowed#3271
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…en slave replication sequence
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we found the master_repl_offset is smaller than slave offset during exec "info replication" command, then the lag value is overflowed
eg:
#Replication
role:master
connected_slaves:2
slave0:xxxxxx
slave1:ip=xxxxx,port=xxxxx,offset=190907912,lag=18446744073709551607
master_repl_offset:190907903