Adding nova packages packaging in ubuntu/icehosue to use contrail/icehosue repo to build all nova-packages locally.
This will enable all VPC features in ubuntu/icehouse build in R1.10.
Removed stock nova-packages from depends_packages.cfg and add in contrail_packages.cfg

Change-Id: I8f945b250a978ec58cb4c0090f2abd05ba1ca918