Imports of trillian_map_client command

PathSynopsis
flagPackage flag implements command-line flag parsing.
github.com/golang/glogPackage glog implements logging analogous to the Google-internal C++ INFO/ERROR/V setup.
github.com/google/trillianPackage trillian contains the generated protobuf code for the Trillian API.
github.com/google/trillian/testonlyPackage testonly contains code and data that should only be used by tests.
golang.org/x/net/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.