The actual readline usage was removed in commit f19218f (Remove duplicate and unused utility code, https://fedorahosted.org/freeipa/ticket/2650) and the import remained.
Readline should not be initialized if the output is not to terminal (and it does no checks itself, so import in anything that would be useful to redirect should be conditional), since it may garble the output [1]:
$ TERM=xterm python -c 'import readline' |hexdump -C 00000000 1b 5b 3f 31 30 33 34 68 |.[?1034h| 00000008
[1] https://bugzilla.redhat.com/show_bug.cgi?id=304181#c1
Suggested fix, with commit message poetry 0001-Drop-unused-readline-import.patch
This should fix #2691. I can take the review.
master: 8c553ab[[BR]] ipa-3-0: 35827a1
Metadata Update from @lkundrak: - Issue assigned to pviktori - Issue set to the milestone: FreeIPA 3.1 Stabilization
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