'This method will check to see if the supplied username exists for
host specified.  If the user exists True is returned, otherwise False
is returned'

@property
def exists(self):

    try:
        options = [self.user, self.host]
        (rc, out, err) = self.run_command('check_account', options)
    except EjabberdUserException:
        e = get_exception()
        (rc, out, err) = (1, None, 'required    attribute(s)    missing')
    return (not bool(int(rc)))
