RESTORE: accept RDB dumps with older versions.
Reference issue #3218. Checking the code I can't find a reason why the original RESTORE code was so opinionated about restoring only the current version. The code in to `rdb.c` appears to be capable as always to restore data from older versions of Redis, and the only places where it is needed the current version in order to correctly restore data, is while loading the opcodes, not the values itself as it happens in the case of RESTORE. For the above reasons, this commit enables RESTORE to accept older versions of values payloads.
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