Update changelog for 2.0.15 #181

Job	Run time
lint-unit / cookstyle	22s
lint-unit / markdown-link-check	14s
lint-unit / markdownlint-cli2	5s
lint-unit / rspec	35s
lint-unit / yamllint	8s
lint-unit / check-metadata	0s
integration (almalinux-8, client)	1m 39s
integration (almalinux-8, server)	1m 29s
integration (almalinux-9, client)	1m 23s
integration (almalinux-9, server)	1m 35s
integration (centos-7, client)	28s
integration (centos-7, server)	27s
integration (centos-stream-8, client)	27s
integration (centos-stream-8, server)	24s
integration (centos-stream-9, client)	2m 3s
integration (centos-stream-9, server)	1m 52s
integration (debian-10, client)	23s
integration (debian-10, server)	24s
integration (debian-11, client)	1m 10s
integration (debian-11, server)	1m 3s
integration (rockylinux-8, client)	1m 41s
integration (rockylinux-8, server)	1m 34s
integration (rockylinux-9, client)	1m 30s
integration (rockylinux-9, server)	1m 40s
integration (ubuntu-1804, client)	24s
integration (ubuntu-1804, server)	24s
integration (ubuntu-2004, client)	1m 5s
integration (ubuntu-2004, server)	1m 7s
integration (ubuntu-2204, client)	1m 5s
integration (ubuntu-2204, server)	1m 40s
	28m 21s

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