Create and return an authentication token, the clear load needs to
        contain the eauth key and the needed authentication creds.

def mk_token(self, load):
        '''
        Create and return an authentication token, the clear load needs to
        contain the eauth key and the needed authentication creds.
        '''
        token = self.loadauth.mk_token(load)
        if not token:
            log.warning('Authentication failure of type "eauth" occurred.')
            return ''
        return token