add db for portbing ex to save host

Registered by yong sheng gong

if the plugin supports the portbind extension, the nova compute will pass in binding:host_id to port model. https://review.openstack.org/#/c/21141/
The host information is important for multihost feature and other features that have algorithms depending on host segment

Blueprint information

Status:
Complete
Approver:
Mark McClain
Priority:
Medium
Drafter:
None
Direction:
Approved
Assignee:
yong sheng gong
Definition:
Approved
Series goal:
Accepted for havana
Implementation:
Implemented
Milestone target:
milestone icon 2013.2
Started by
Mark McClain
Completed by
yong sheng gong

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Gerrit topic: https://review.openstack.org/#q,topic:bp/portbinding-ex-db,n,z

Addressed by: https://review.openstack.org/24969
    add db to save host for port

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