'Load RHSM configuration from /etc/rhsm/rhsm.conf.
Returns:
* ConfigParser object'

def _read_config(self, rhsm_conf='/etc/rhsm/rhsm.conf'):

    cp = ConfigParser.ConfigParser()
    cp.read(rhsm_conf)
    def get_option_default(self, key, default=''):
        (sect, opt) = key.split('.', 1)
        if (self.has_section(sect) and self.has_option(sect, opt)):
            return self.get(sect, opt)
        else:
            return default
    cp.get_option = types.MethodType(get_option_default, cp, ConfigParser.ConfigParser)
    return cp
