[cluster-test] Log command used to fetch genesis.blob
[cluster-test] Log command used to fetch genesis.blob

Closes: #1665
Approved by: dmitri-perelman

aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core