script for configuring a vif in Xen in non-bridged mode

Creates a new vif device without attaching it to a
bridge. Quantum Linux Bridge Agent will attach the
created device to the belonging bridge.

Change-Id: I1818a92a47882d98e384b57e0fa84a0fa09d40ea
Cells: Add cells API extension

Enables cells-related functionality such as adding neighbor cells,
listing neighbor cells, and showing the capabilities of the local cell.

Implements blueprint nova-compute-cells

DocImpact

Change-Id: Iacc1e68721a7867aeaf233903cbe6d18f09ad96e
Cells: Add some cells support to admin_actions extension

Add clearing of instance state in a way that works with cells.

Implements blueprint nova-compute-cells

Change-Id: I1cc1560bceb842c3bc82c6e9510eaef8a4931293
Remove unused import.

Direct usage of the db has been eliminated from nova.service, so remove
the import.

Part of bp no-db-compute.

Change-Id: I909daccaf5dc0f26ad72914f90c9e2134e8decaf
Merge "Cells: Add some cells support to admin_actions extension"
Merge "Remove unused import."
Merge "Cells: Add cells API extension"
Merge "script for configuring a vif in Xen in non-bridged mode"