This change adds a new chore that will check for failed invoices and
potentially freeze corresponding accounts.
It makes slight modifications to stripemock.go and invoices.go (adding
stripe CustomerID to the Invoice struct).
Issue: https://github.com/storj/storj-private/issues/140
Change-Id: I161f4037881222003bd231559c75f43360509894
The current satellitedb.dbx has grown quite big over time.
Split the single file into multiple smaller ones.
Change-Id: I8d6ca851b834ac60820aff565906f04aab661875