bug: #3512434 Outdated revisions are not added to queue unless they are resaved

Alex Pottrequested to merge
issue/node_revision_delete-3512434:3512434-time-based-approach into 2.1.x

Conflicts:

node_revision_delete.module

src/NodeRevisionDelete.php

src/Plugin/NodeRevisionDelete/Created.php

Closes #3512434

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