Automatic merge from submit-queue
choose a particular directory test-integration
Enables `make test-integration WHAT=auth` or whatever particular integration test director you want to run.
This allows us to start building real dependencies into Makefile.
Leave old hack/* scripts in place but advise to use 'make'. There are a few
rules that call things like 'go run' or 'build/*' that I left as-is for now.