designate xena-em release

meta:version: xena-em
meta:diff-start: -
meta:series: xena
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Előd Illés <elod.illes@est.tech>
meta:release:Commit: Előd Illés <elod.illes@est.tech>
meta:release:Change-Id: I935cd1a0d410717981e3ecfc3ee42631dc19feb1
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Elod Illes <elod.illes@est.tech>
meta:release:Code-Review+2: Elod Illes <elod.illes@est.tech>
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