ACME tests: fix issue_and_expire_acme_cert method
    
    The fixture issue_and_expire_acme_cert is changing the date
    on master and client. It also resets the admin password as
    it gets expired after the date change.
    Currently the code is resetting the password by performing
    kinit on the client, which leaves the master with an expired
    ticket in its cache. Reset the password on the master instead
    in order to have a valid ticket for the next operations.
    
    Fixes: https://pagure.io/freeipa/issue/9383
    
    Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Mohammad Rizwan <myusuf@redhat.com>