Return default config

:rtype: dict

def get_default_config(self):
        """
        Return default config

:rtype: dict

        """
        config = super(OpenLDAPCollector, self).get_default_config()
        config.update({
            'path': 'openldap',
            'host': 'localhost',
            'port': 389,
            'username': 'cn=monitor',
            'password': 'password',
        })
        return config