ipatests: test_otp: convert test_2fa_enable_single_prompt to run_ssh_cmd
Paramiko is not compatible with FIPS.
Migrate test_2fa_enable_single_prompt to the OpenSSH CLI SSH(1).
Rationale: this is exactly what clients use.
Also add a warning when test_2fa_disable_single_prompt is executed in FIPS mode.
Fixes: https://pagure.io/freeipa/issue/8129
Signed-off-by: François Cami <fcami@redhat.com>
Reviewed-By: Mohammad Rizwan <myusuf@redhat.com>
Reviewed-By: Michal Polovka <mpolovka@redhat.com>