Updated from global requirements

Change-Id: Iec62e381c079d1a71bd5d49f09cf71f6f4f68f72
move rpc_setup to the last step of __init__

rpc setup should be the last stuff in agent initialization
so that the rcp message handler(the agent instance itself)
can have a fully initialized agent instance.

Change-Id: I58c966e2c8ee92c307b565932e867b5d1ec73b67
Closes-Bug: #1259088
Add X-Tenant-ID to metadata request

Previously, one could update a port's device_id to be that of
another tenant's instance_id and then be able to retrieve that
instance's metadata. In order to prevent this X-Tenant-ID is now
passed in the metadata request to nova and nova then checks that
X-Tenant-ID also matches the tenant_id for the instance against it's
database to ensure it's not being spoofed.

DocImpact - When upgrading OpenStack nova and neturon, neutron
            should be updated first (and neutron-metadata-agent
            restarted before nova is upgraded) in order to minimize
            downtime. This is because there is also a patch to nova
            which has checks X-Tenant-ID against it's database
            therefore neutron-metadata-agent needs to pass that
            before nova is upgraded for metadata to work.

Change-Id: I2b8fa2f561a7f2914608e68133abf15efa95015a
Closes-Bug: #1235450
Merge "move rpc_setup to the last step of __init__"
Merge "Add X-Tenant-ID to metadata request"
Merge "Updated from global requirements"