Update lint-unit to v3 #315

Job	Run time
lint-unit / markdown-link-check	23s
lint-unit / markdownlint-cli2	5s
lint-unit / check-metadata	0s
lint-unit / cookstyle	37s
lint-unit / rspec	2m 20s
lint-unit / yamllint	11s
integration (centos-7, client)	1m 20s
integration (centos-7, default)	1m 40s
integration (centos-8, client)	38s
integration (centos-8, default)	37s
integration (debian-9, client)	1m 22s
integration (debian-9, default)	1m 21s
integration (debian-10, client)	1m 19s
integration (debian-10, default)	1m 38s
integration (ubuntu-1604, client)	42s
integration (ubuntu-1604, default)	40s
integration (ubuntu-1804, client)	1m 34s
integration (ubuntu-1804, default)	1m 23s
integration (ubuntu-2004, client)	1m 34s
integration (ubuntu-2004, default)	1m 39s
integration (amazonlinux-2, client)	1m 22s
integration (amazonlinux-2, default)	1m 21s
	23m 46s

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