oslo.log 3.28.1 release

meta:version: 3.28.1
meta:diff-start: -
meta:series: pike
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Doug Hellmann <doug@doughellmann.com>
meta:release:Commit: Doug Hellmann <doug@doughellmann.com>
meta:release:Change-Id: I4cc8439263b8a2a52d4e0acf14345a45b99d1d64
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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