oslo.middleware 3.19.1 release

meta:version: 3.19.1
meta:diff-start: -
meta:series: newton
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Alan Pevec <alan.pevec@redhat.com>
meta:release:Commit: Doug Hellmann <doug@doughellmann.com>
meta:release:Change-Id: Ic6bc3ef87455b558350c37095ada5041eb72b4d2
meta:release:Code-Review+1: ChangBo Guo(gcb) <glongwave@gmail.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Alan Pevec <alan.pevec@redhat.com>
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