Add a change cleanup job that runs periodically in the background.
This cleanup job can automatically abandon open changes that have been
inactive for a defined time.
Abandoning old inactive changes has a few advantages:
- it reduces the load for recomputing the mergeability flag when a
change is merged
- it keeps dashboards clean
- it signals change authors that changes are considered outdated
Change-Id: Ia798667901fe8d734ca29bcf81c7b9b4a1eb4c50
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
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