Imports of gnostic-summary command

PathSynopsis
github.com/golang/protobuf/protoPackage proto provides functionality for handling protocol buffer messages.
github.com/google/gnostic/openapiv2
github.com/google/gnostic/openapiv3
github.com/google/gnostic/plugins
github.com/google/gnostic/printerPackage printer provides support for writing generated code.
logPackage log implements a simple logging package.
path/filepathPackage filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths.