oslo.db 4.21.1 release

meta:version: 4.21.1
meta:diff-start: -
meta:series: pike
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: ChangBo Guo(gcb) <eric.guo@easystack.cn>
meta:release:Commit: Davanum Srinivas <davanum@gmail.com>
meta:release:Change-Id: I09c1e4471715f7b76cec0f2d7ff666c33a9c4379
meta:release:Code-Review+2: Davanum Srinivas (dims) <davanum@gmail.com>
meta:release:Workflow+1: Davanum Srinivas (dims) <davanum@gmail.com>
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