Imports of nonce command

PathSynopsis
encoding/jsonPackage json implements encoding and decoding of JSON as defined in RFC 7159.
github.com/coreos/go-oidcPackage oidc implements OpenID Connect client logic for the golang.org/x/oauth2 package.
golang.org/x/net/contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
golang.org/x/oauth2Package oauth2 provides support for making OAuth2 authorized and authenticated HTTP requests, as specified in RFC 6749.
logPackage log implements a simple logging package.
net/httpPackage http provides HTTP client and server implementations.
osPackage os provides a platform-independent interface to operating system functionality.