Imports of policyenginesimulator command

PathSynopsis
encoding/jsonPackage json implements encoding and decoding of JSON as defined in RFC 7159.
flagPackage flag implements command-line flag parsing.
github.com/Microsoft/hcsshim/internal/guestpath
github.com/Microsoft/hcsshim/internal/regopolicyinterpreter
github.com/Microsoft/hcsshim/pkg/securitypolicy
logPackage log implements a simple logging package.
osPackage os provides a platform-independent interface to operating system functionality.
pathPackage path implements utility routines for manipulating slash-separated paths.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.