kolla-ansible 15.3.0 release

meta:version: 15.3.0
meta:diff-start: -
meta:series: zed
meta:branch: stable/zed
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Dr. Jens Harbott <harbott@osism.tech>
meta:release:Commit: Dr. Jens Harbott <frickler@offenerstapel.de>
meta:release:Change-Id: Ic477def28a926422e735792b4b862261fe1d84c6
meta:release:Code-Review+1: Sven Kieske <kieske@osism.tech>
meta:release:Code-Review+1: Will Szumski <will@stackhpc.com>
meta:release:Code-Review+2: Hervé Beraud <herveberaud.pro@gmail.com>
meta:release:Workflow+1: Elod Illes <elod.illes@est.tech>
meta:release:Code-Review+2: Elod Illes <elod.illes@est.tech>