Tests add index update step to flaky tests

Following a suggestion by Elz in chat, added the existing "And all search indexes are updated" step to the tests that fail intermittently. Since the problem is intermittent, it might be hard to tell if it's actually fixed, though the changes don't seem to have made things worse on Codeship at least, since it passed there for me.

*waits for Codeship and Travis to get going...*