Imports of vet command

PathSynopsis
bytesPackage bytes implements functions for the manipulation of byte slices.
cmd/vet/internal/cfg
cmd/vet/internal/whitelist
errorsPackage errors implements functions to manipulate errors.
flagPackage flag implements command-line flag parsing.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
go/astPackage ast declares the types used to represent syntax trees for Go packages.
go/buildPackage build gathers information about Go packages.
go/constantPackage constant implements Values representing untyped Go constants and their corresponding operations.
go/importerPackage importer provides access to export data importers.
go/parserPackage parser implements a parser for Go source files.
go/printerPackage printer implements printing of AST nodes.
go/tokenPackage token defines constants representing the lexical tokens of the Go programming language and basic operations on tokens (printing, predicates).
go/typesPackage types declares the data types and implements the algorithms for type-checking of Go packages.
io/ioutilPackage ioutil implements some I/O utility functions.
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.
reflectPackage reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types.
regexpPackage regexp implements regular expression search.
strconvPackage strconv implements conversions to and from string representations of basic data types.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.
unicodePackage unicode provides data and functions to test some properties of Unicode code points.
unicode/utf8Package utf8 implements functions and constants to support text encoded in UTF-8.