OSP 4 to OSP5 upgrade failed because neutron ports do not have any 'vif_details' set
Issue
Previously, the Open vSwitch core plugin id not use 'vif_details' when providing port binding information to Compute (nova).
Consequently, during migration from the OVS plugin to ML2 there was no definitive source for the 'vif_details' column in the database.
Environment
Red Hat Openstack-4 using Packages older than openstack-neutron-2014.1.4-6.el6ost.noarch.rpm
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