oslo.middleware 3.21.0 release

meta:version: 3.21.0
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Joshua Harlow <jxharlow@godaddy.com>
meta:release:Commit: Joshua Harlow <jxharlow@godaddy.com>
meta:release:Change-Id: Ic7c5f479cadb40da83d4343eb422ffb1156797b5
meta:release:Code-Review+1: Sergey Nikitin <snikitin@mirantis.com>
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

iQEcBAABAgAGBQJYQFGSAAoJELkGmxM1cAzcH50H/2xOcxDAUrXOy1JEfAqOsJA2
qfTXKkx18TzwHqBjjVaIT+HeVBxNAkKkn96gvYMpuUAUxXbTLFNAo3sCzcEDqr7r
0yK5f8kQVymQT3nUeJlavgiLTHzaOFJi30SmL0K/IgUHFUQUVyP/O7/c7hSILtI7
IXbhFtLrLbAlEmVPfOz+4DCdZvJFa95ZwpQvu4VGANoJBz8JTKhFDxAV8yEy0p4q
ugbGdX7lRoLgFPqeC5bhfH8qAvnXjqBj1+gl1LA95b1yqyZom3nitVddN6MslH6L
pTP0AhIMUXZn1u4ayPO5AyVzd0IPGsvgTqGKC/PDdw3P9v8dPqyJSJ+QF3xjsw0=
=dJyR
-----END PGP SIGNATURE-----