Imports of helloworld_client command

PathSynopsis
go.opencensus.io/examples/exporterPackage exporter contains a log exporter that supports exporting OpenCensus metrics and spans to a logging framework.
go.opencensus.io/plugin/ochttpPackage ochttp provides OpenCensus instrumentation for net/http package.
go.opencensus.io/stats/viewPackage view contains support for collecting and exposing aggregates over stats.
go.opencensus.io/tracePackage trace contains support for OpenCensus distributed tracing.
logPackage log implements a simple logging package.
net/httpPackage http provides HTTP client and server implementations.
timePackage time provides functionality for measuring and displaying time.