Updated scheduler and compute for multiple capabilities.

Part 1 of 6: blueprint general-bare-metal-provisioning-framework.

This patch includes updates on scheduler and compute codes for
multiple capabilities. This feature is needed in bare-metal
provisioning which is implemented in later patches --- a bare-metal
nova-compute manages multiple bare-metal nodes where instances are
provisioned. Nova DB's compute_nodes entry needs to be created for
each bare-metal node, and a scheduler can choose an appropriate
bare-metal node to provision an instance.

With this patch, one service entry with multiple compute_node entries
can be registered by nova-compute. Distinct 'node name' is given for
each node and is stored at compute_node['hypervisor_hostname'].
And we added a new column "node" to "instances" table in Nova DB to
associate instances with compute_node. FilterScheduler puts <nodename>
to the column when it provisions the instance. And nova-computes
respect <nodename> when run/stop instances and when calculate
resources.

Also, 'capability’ is extended from a dictionary to a list of
dictionaries to describe the multiple capabilities of the multiple
nodes.

Change-Id: I527febe4dbd887b2e6596ce7226c1ae3386e2ae6
Co-authored-by: Mikyung Kang <mkkang@isi.edu>
Co-authored-by: David Kang <dkang@isi.edu>
Co-authored-by: Ken Igarashi <igarashik@nttdocomo.co.jp>
Co-authored-by: Arata Notsu <notsu@virtualtech.jp>

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