Imports of package helpers

PathSynopsis
encoding/jsonPackage json implements encoding and decoding of JSON as defined in RFC 7159.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/Microsoft/hcsshim/ext4/tar2ext4
github.com/Microsoft/hcsshim/pkg/securitypolicy
github.com/google/go-containerregistry/pkg/authn
github.com/google/go-containerregistry/pkg/name
github.com/google/go-containerregistry/pkg/v1
github.com/google/go-containerregistry/pkg/v1/remote
github.com/opencontainers/runtime-spec/specs-go
logPackage log implements a simple logging package.
osPackage os provides a platform-independent interface to operating system functionality.
strconvPackage strconv implements conversions to and from string representations of basic data types.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.