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.
google.golang.org/grpcPackage grpc implements an RPC system called gRPC.
google.golang.org/grpc/credentialsPackage credentials implements various credentials supported by gRPC library, which encapsulate all the state needed by a client to authenticate with a server and make various assertions, e.g., about the client's identity, role, or whether it is authorized to make a particular call.
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.
path/filepathPackage filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths.