This was previously fixed in [38837], but it wasn't really the correct answer, to fix it in the theme. So, [38837] is reverted in this commit, and the Twenty Seventeen actions causing problems are unhooked before tests are run.
See #38372.
Built from https://develop.svn.wordpress.org/trunk@38850
git-svn-id: http://core.svn.wordpress.org/trunk@38793 1a063a9b-81f0-0310-95a4-ce76da25c4cd