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
Removed batch insert of payments since they do not guarantee order. Order of payments sent to the payments DB is important, because the billing chore will request new payments based on the last received payment. If the last payment inserted is not the last payment received, duplicate payments will be inserted into the billing table.
Change-Id: Ic3335c89fa8031f7bc16f417ca23ed83301ef8f6