Imports of benchwrapper command

PathSynopsis
cloud.google.com/go/storagePackage storage provides an easy way to work with Google Cloud Storage.
cloud.google.com/go/storage/internal/benchwrapper/proto
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
flagPackage flag implements command-line flag parsing.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
google.golang.org/grpcPackage grpc implements an RPC system called gRPC.
ioPackage io provides basic interfaces to I/O primitives.
io/ioutilPackage ioutil implements some I/O utility functions.
logPackage log implements a simple logging package.
netPackage net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets.
osPackage os provides a platform-independent interface to operating system functionality.