ipatests: Take otptoken import test out of execution
The issue reported in ticket [1] hasn't been solved yet.
This patch prevents the test cases for OTP import being run.
The change is intended as a *temporary* workaround until
proper fix for the issue is introduced.
[1] https://fedorahosted.org/freeipa/ticket/5192
Reviewed-By: Martin Basti <mbasti@redhat.com>