Enforce goimports, add tooling and documentation, and run it on the repo.
Change-Id: Ieb04e6d26c7778d8a8afbbeaee79d764d9f2cd31
Calling guardiand a bridge dates back to v1 and no longer makes sense. Change-Id: I27d24a5d7a64c3e37d6a5ce9c402c6248ad9c59e