Updated openstack/openstack
Project: openstack/neutron  2a0a40e5d277cde47186a022ab8e6c1376c49c4d
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LBaaS: when returning VIP include session_persistence even if None

Closes-Bug: #1231915
Change-Id: I3dc5e17118995fb49dd381d08c9d92cb60b80abb