Set up leader on cloud service

[garious]

• Choose a cloud service
• Open UDP ports up, 8000-10000 to public
• Allocate an IP address
• testnet.solana.com should resolve to the leader in the world
• the crdt may need to handle virtual and physical addresses

[aeyakovenko]

@mvines I have a google cloud quota set up. lets just use that.

[mvines]

Do we want a couple leaders?

1. A HEAD leader that auto updates/restarts on every new commit into the master branch (or perhaps updates nightly)
2. A more "stable" leader that is updated whenever a new release is tagged

We could start with (1) initially either way.

[mvines]

Recommended GPU size is 4 x K80

[mvines]

testnet.solana.com is now configured from the infra side. It points to a GCP static address with w/ rsync and UDP port firewall rules setup. The VM that currently backs it is not ready for use yet, please stay clear for a while longer. 🚧

[mvines]

This is all done from the infra side. Filed #458 for the remaining runtime issue