Imports of package store

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
encoding/jsonPackage json implements encoding and decoding of JSON as defined in RFC 7159.
github.com/Microsoft/hcsshim/internal/ncproxy/networking
github.com/pkg/errorsPackage errors provides simple error handling primitives.
go.etcd.io/bboltpackage bbolt implements a low-level key/value store in pure Go.