'Attach a member to balancer
:param balancer: LoadBalancer which should be used
:type  balancer: :class:`LoadBalancer`
:param member: Member to join to the balancer
:type member: :class:`Member`
:return: Member after joining the balancer.
:rtype: :class:`Member`'

def balancer_attach_member(self, balancer, member):

    raise NotImplementedError('balancer_attach_member    not    implemented    for    this    driver')
