Add the users current wallet balance to the endpoints for claiming and listing storjscan wallets. Also prevent a user with a claimed wallet address from claiming a new wallet.
Change-Id: I0dbf1303699f924d05c8c52359038dc5ef6c42a1
Add storjscan wallets DB to the satellite. For now this DB is a one to one mapping of the users account to a storjscan wallet that can be used by the account holder to make payments on their Storj account.
relates to https://github.com/storj/storj/issues/4347
Change-Id: I6e65b15817b90ceb75641244f9bf173c3b4228a7