Say what customer was affected

Merge branch 'bill-with-note'

* bill-with-note:
  Add a note when billing account

Add a note when billing account

Merge branch 'monthly-billing'

* monthly-billing:
  Allow the DB to notify us to bill a customer
  Command.execution setter
  Bill plan command
  Clearer name for lock bypass factory

Bill plan command

Implements the full logic of the billing_monthly_cronjob for one customer by
reusing code that has been written more robustly in sgx-jmp for some time.  This
will allow the cronjob to just execute this command once a day for each expiring
customer to get all the correct billing behaviours.