Description of problem:
During work on https://bugzilla.redhat.com/show_bug.cgi?id=579830
I find that if we send unicode string in xmlrpc, we will get from server rhnFault

While running 'registration.add_hw_profile': caught
exceptions.UnicodeEncodeError : 'ascii' codec can't encode character u'\xae' in position 44: ordinal not in range(128) 

This is becouse we do in backend/server/rhnSQL/driver_cx_Oracle.py
     def _execute_wrapper(self, function, *p, **kw):
        params =  ','.join(["%s: %s" % (str(key), str(value)) for key, value \

and str on e.g. '\xae' will fail.