Imports of testproxy command

PathSynopsis
cloud.google.com/go/bigtablePackage bigtable is an API to Google Cloud Bigtable.
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
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.
github.com/googleapis/cloud-bigtable-clients-test/testproxypb
google.golang.org/api/option
google.golang.org/genproto/googleapis/bigtable/v2Package bigtable aliases all exported identifiers in package "cloud.google.com/go/bigtable/apiv2/bigtablepb".
google.golang.org/genproto/googleapis/rpc/status
google.golang.org/grpcPackage grpc implements an RPC system called gRPC.
google.golang.org/grpc/codesPackage codes defines the canonical error codes used by gRPC.
google.golang.org/grpc/credentials/insecurePackage insecure provides an implementation of the credentials.TransportCredentials interface which disables transport security.
google.golang.org/grpc/statusPackage status implements errors returned by gRPC.
google.golang.org/protobuf/types/known/durationpbPackage durationpb contains generated types for google/protobuf/duration.proto.
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.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.
syncPackage sync provides basic synchronization primitives such as mutual exclusion locks.
timePackage time provides functionality for measuring and displaying time.