fluentd: migrate to td-agent 4 where possible

Message ID 739935@I86ecdc1ac45dfd76b94a34d1b837f7c0bc975dcd
State Accepted
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Message

Marcin Juszkiewicz July 8, 2020, 9:18 a.m.
Project: openstack/kolla
https://review.openstack.org/#/c/739935/

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