PSYNC2: second_replid_offset should be real meaningful offset
PSYNC2: second_replid_offset should be real meaningful offset

After adjustMeaningfulReplOffset(), all the other related variable
should be updated, including server.second_replid_offset.

Or the old version redis like 5.0 may receive wrong data from
replication stream, cause redis 5.0 can sync with redis 6.0,
but doesn't know meaningful offset.

JackieXie168/redis,JackieXie168/redis,JackieXie168/redis,JackieXie168/redis