LUCI Auth libraries

This package contains auth related elements for LUCI programs.

• This package - Implements a wrapper around golang.org/x/oauth2 which is aware of how LUCI programs handle OAuth2 credentials.
• client - Command-line flags and programs to interact with luci/auth from clients of LUCI systems.
• identity - Defines common LUCI identity types and concepts. Used by clients and servers.
• integration - Libraries for exporting LUCI authentication tokens (OAuth2) to other systems (like gsutil or gcloud).