oslo.messaging 5.21.0 release

meta:version: 5.21.0
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: ChangBo Guo(gcb) <eric.guo@easystack.cn>
meta:release:Change-Id: I02c281476e461fc3ee50dfb296c5bf208bde1dd7
meta:release:Code-Review+1: Sean Dague <sean@dague.net>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iQEcBAABAgAGBQJY7TwYAAoJEOtsyhSD+nTs9OcH/ivQ/hr6n3FZmmocb/CBzbCt
kwTg07lL4qMJ+P7bbfxxXb5ocA3hGJBj5pBMo/s5zp0NoZdiw6XjJn903kcjxBQ2
R17Be2hI5X0bbsu3rPwD9AN19X2RbLMmi49Cb1OREUKutOSWVl3dftgKODxJOwPE
OtvrsMNmhfgyAFuKJlqdpoQ2buqS5KqZYiTBLrGgBUXi8BWBGS5FpsuC64G9BoLj
+VTHQAKWIAmKIyMJCUe3i3qSwJe6B4rxjxM+B9Awf1Qfd4g9CudaKg9JYJ/2Uei/
ul5+dA0eQjju0wLUahXh0GTuw0ZBbBy5NNapuldJCzA7l7cPmZq1PdBI4Qnw/dg=
=rzV4
-----END PGP SIGNATURE-----