Create NodeEvents Chore on satellite core to read nodeevents DB and
notify node operators on node events. The chore sends notifications
grouped by email and event type: it selects the oldest entry in
nodeevents.DB and also any other event with the same email and event
type no matter how old it is. The oldest entry of a group must exist for
a minimum amount of time before that group can be selected, however.
This minimum amount of time is a configurable value:
--node-events.selection-wait-period. This wait period allows us to
combine events of the same time and same email address into a singular
email.
Change-Id: I8b444aa324d2dae265cc27d9e9e85faef79195d8
Implement node events DB with Insert and GetLatestByEmailAndEvent. Get
was changed to GetLatestByEmailAndEvent so we can verify items are being
inserted into the table without needing the ID, which is not available
to us in the tests.
Change-Id: I4abe63631c44774cd7e795fbab0cbab4d801db4c
