Calle Wilund 2bc98aebaf db::commitlog: Do segment delete async + force replay delete go via CL ...

Refs #2858

Push segement files to be deleted to a pending list, and process at
intervals or flush-requests (or shutdown). Note that we do _not_
indescrimenately do deletes in non-anchored tasks, because we need
to guarantee that finshed segments are fully deleted and gone on CL
shutdown, not to be mistaken for replayables.

Also make sure we delete segments replayed via commitlog call,
so IFF we add metadata processing for CL, we can clear it out.

2018-03-26 11:58:27 +00:00

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