Remove tuple unpacking from except clause contrib/RHEL4/ipachangeconf.py
    
    Python 3 doesn't support tuple unpacking in except clauses. All implicit
    tuple unpackings have been replaced with explicit unpacking of e.args.
    
    https://fedorahosted.org/freeipa/ticket/5120
    
    Reviewed-By: Tomas Babej <tbabej@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>