Plumb NetworkRequest objects through conductor and compute RPC

This makes the conductor and compute RPC paths for building instances
support and use NetworkRequest objects, which gets this all the way
down to the compute managers.

Change-Id: Ia45e15896b80ae33533d77719dd23bbdf60a1945
Instance objects: fix indentation issue

Fixes a minor indetation issue.

Change-Id: Ifd1dbc9be51f60a4d4099c742d183918184768bf
Merge "Instance objects: fix indentation issue"
Merge "Plumb NetworkRequest objects through conductor and compute RPC"