Set a dateformat on logrotate configs on CoreOS

[ripta]

Closes #5378.

On CoreOS Container Linux, /usr/share/logrotate/logrotate.conf (which is on a read-only mount) enables dateext, which causes maxsize-based log rotation to fail when a previous rotation already happened on the calendar same day. This has the undesirable effect that kube-system logs in /var/log grow unbounded until it dominates and fills up /.

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[ripta]

/assign @chrislovecnm

Ready for review.

[chrisz100]

/ok-to-test

[justinsb]

Thanks @ripta - I also appreciate it being a focused fix, as it makes it easier to apply at this stage in the cycle, even if we'll likely want to broaden it in future.

/approve
/lgtm

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This pull-request has been approved by: justinsb, ripta

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