veyron2/services/mgmt/node,veyron/services/mgmt/node,veyron/tools/mgmt: rename node->device, cl 3 of N (go/vissue/496)
veyron2/services/mgmt/node,veyron/services/mgmt/node,veyron/tools/mgmt: rename node->device, cl 3 of N (go/vissue/496)

Rename files and packages.

Change-Id: I29199a97c2ca6d6eb721e0d9fe41a71044e52579

vanadium/go.lib