Report default port-bindings when VMI doesnt have any bindings property

[Hampapur Ajay]

As part of
https://bugs.launchpad.net/juniperopenstack/+bug/1524183
https://review.opencontrail.org/#/c/15700/

bindings of 'vif_type', 'vif_details', 'vnic_type' migrated from contrail_plugin_base.py to layer converting between neutron and contrail representation (vnc_openstack/neutron_plugin_db.py for plugin-version-2 and vmi_res_handler.py for plugin-version-3)

However it has broken the upgrade case where VMI created prior to this version of s/w has no bindings property. Treat such VMIs so they report the binding keys as before upgrade(i.e. hard-coded to vrouter/port_filter:True/normal)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/16224
Submitter: Hampapur Ajay (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/16224
Committed: http://github.org/Juniper/contrail-controller/commit/4ae954db39d51963f33e41c3d74dcdc5b52c6f0a
Submitter: Zuul
Branch: master

commit 4ae954db39d51963f33e41c3d74dcdc5b52c6f0a
Author: Hampapur Ajay <email address hidden>
Date: Mon Jan 11 15:54:28 2016 -0800

Handle upgrade case where vmi doesn't have bindings property and
return bindings dict as earlier (vrouter,normal..)

Change-Id: I94254ee43d0cddc5f5cf84cc5bb634f56f0d7e01
Closes-Bug: 1532987