test_acme: make password renewal more robust
A kinit immediately following a password change can fail.
Setting KRB5_TRACE and retrieving kdcinfo will help to understand
the cause of failure.
Fixes: https://pagure.io/freeipa/issue/8929
Signed-off-by: François Cami <fcami@redhat.com>
Reviewed-By: Michal Polovka <mpolovka@redhat.com>