Register the host on the RHSM.

        :param rhsm: a dict of parameters (login, password, pool_id)

def rhsm_register(self, rhsm):
        """Register the host on the RHSM.

        :param rhsm: a dict of parameters (login, password, pool_id)
        """
        # Get rhsm credentials
        login = rhsm.get('login')
        password = rhsm.get('password', os.environ.get('RHN_PW'))
        pool_id = rhsm.get('pool_id')
        # Ensure the RHEL beta channel are disabled
        self.run('rm /etc/pki/product/69.pem', ignore_error=True)
        custom_log = 'subscription-manager register --username %s --password *******' % login
        self.run(
            'subscription-manager register --username %s --password "%s"' % (
                login, password),
            success_status=(0, 64),
            custom_log=custom_log,
            retry=3)
        if pool_id:
            self.run('subscription-manager attach --pool %s' % pool_id)
        else:
            self.run('subscription-manager attach --auto')
        self.rhsm_active = True