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add missed attribute `email_subject_suffix` @rymai attribute `email_subject_suffix` was added in gitlab-org/gitlab-ce!6172 but I didn't noticed that we must add it here too. So it caused this attribute doesn't work in `Omnibus package installation` V8.13 See merge request !1061 Signed-off-by: Rémy Coutable <remy@rymai.me>