container logs lose line(s) (the last one)

[tnozicka]

At least the last line of logs get lost sometimes causing flakes in various tests. Test use oc logs command.

I've found some old hack with sleep 1 at the end of the container command which appear to mitigate the issue mostly, but flake sometimes as well.

Here are some flakes caused by this:

• [Conformance] deploymentconfigs with custom deployments should run the custom deployment steps flakes #17631 (comment)
• https://openshift-gce-devel.appspot.com/build/origin-ci-test/pr-logs/pull/17606/test_pull_request_origin_extended_conformance_gce/12465/
• https://openshift-gce-devel.appspot.com/build/origin-ci-test/pr-logs/pull/17576/test_pull_request_origin_end_to_end/6690/
• more ...

cc: @mfojtik @soltysh @deads2k

[tnozicka]

this is likely related:
#12143 (comment)
moby/moby#29863

[soltysh]

So I was talking about #9285, but it looks like the bits mentioned in projectatomic/docker#218 should be in already.

[tnozicka]

@soltysh I don't think we have projectatomic/docker#218 that pr was closed

https://github.com/projectatomic/docker/blob/master/daemon/logger/journald/read.go#L255