Dan Newton 79b36aea8f
CORDA-3601 Record a flow's finish time (#6079)
* CORDA-3601 Record a flow's finish time

Record a flow's finish time by updating its metadata record. It is set
in `updateCheckpoint` by checking the status of the checkpoint. If it is
 `COMPLETED` it will set the `finishInstant` on the metadata object and
 update it.

* CORDA-3601 Record flow finish time for all finished statuses

Update the flow finish time for the following statuses:

- COMPLETED
- KILLED
- FAILED

* CORDA-3601 Use platform clock in `DBCheckpointStorage`
2020-03-25 13:47:00 +00:00
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