Reset the ttl for additional keys
Reset the ttl for additional keys

Before, if a previous key had a TTL set but the current one didn't, the
TTL was reused and thus resulted in wrong expirations set.

This behaviour was experienced, when `MigrateDefaultPipeline` in
redis-trib was set to >1

Fixes #3655

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