Harshavardhana e0b0a351c6
remove IAM old migration code (#15476)
```
commit 7bdaf9bc50eb49061e8a71b9cf471eae5db654ff
Author: Aditya Manthramurthy <donatello@users.noreply.github.com>
Date:   Wed Jul 24 17:34:23 2019 -0700

    Update on-disk storage format for users system (#7949)
```

Bonus: fixes a bug when etcd keys were being re-encrypted.
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