Merge pull request #8 from dschatzberg/forSESA

Change Ebb to store pointer instead of id
Add PCI Enumeration
Improve PCI and start virtio
Add code to send packet
Rename EbbAllocator to EbbManager
Build out EbbManager and move Virtio into an EBB

The EbbManager now supports allocating Ids and binding them. This requires
kicking out the initial root and replacing it with our own.
Change FindRoot to Install on EbbManager