[faucet] specify a gas base unit for testnet
[faucet] specify a gas base unit for testnet

Closes: #145

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