Imports of set-gen command

PathSynopsis
github.com/golang/glogPackage glog implements logging analogous to the Google-internal C++ INFO/ERROR/V setup.
k8s.io/gengo/argsPackage args has common command-line flags for generation programs.
k8s.io/gengo/examples/set-gen/generatorsPackage generators has the generators for the set-gen utility.
osPackage os provides a platform-independent interface to operating system functionality.
path/filepathPackage filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths.