Update lint-unit to v3 #69

Job	Run time
lint-unit / cookstyle	44s
lint-unit / markdown-link-check	19s
lint-unit / markdownlint-cli2	5s
lint-unit / check-metadata	0s
lint-unit / rspec	37s
lint-unit / yamllint	12s
integration (amazonlinux-2, default)	1m 49s
integration (centos-7, default)	2m 40s
integration (centos-8, default)	36s
integration (debian-9, default)	1m 7s
integration (debian-10, default)	2m 17s
integration (ubuntu-1804, default)	2m 18s
integration (ubuntu-2004, default)	3m 26s
integration (fedora-latest, default)	3m 53s
integration (opensuse-leap, default)	4m 20s
	24m 23s

Provide feedback