Testnet update July 24th

We just did a new validator push. The package was built at this commit: https://github.com/libra/libra/commit/0ba0013fd8db3bafd23b80e11f15027b5588e6c1

There were a few breaking changes involving the genesis and the DB, so we had to reset the database:

We realized that mint limit was changed to 1000 Libra, but we have made change to raise the limit for the next release.