Imports of dmverity-vhd command

PathSynopsis
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/Microsoft/hcsshim/ext4/dmverity
github.com/Microsoft/hcsshim/ext4/tar2ext4
github.com/google/go-containerregistry/pkg/authnPackage authn defines different methods of authentication for talking to a container registry.
github.com/google/go-containerregistry/pkg/namePackage name defines structured types for representing image references.
github.com/google/go-containerregistry/pkg/v1Package v1 defines structured types for OCI v1 images
github.com/google/go-containerregistry/pkg/v1/daemonPackage daemon provides facilities for reading/writing v1.Image from/to a running daemon.
github.com/google/go-containerregistry/pkg/v1/remotePackage remote provides facilities for reading/writing v1.Images from/to a remote image registry.
github.com/google/go-containerregistry/pkg/v1/tarballPackage tarball provides facilities for reading/writing v1.Images from/to a tarball on-disk.
github.com/pkg/errorsPackage errors provides simple error handling primitives.
github.com/sirupsen/logrusPackage logrus is a structured logger for Go, completely API compatible with the standard library logger.
github.com/urfave/cliPackage cli provides a minimal framework for creating and organizing command line Go applications.
osPackage os provides a platform-independent interface to operating system functionality.
path/filepathPackage filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths.