Imports of updatetree command

PathSynopsis
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/google/trillianPackage trillian contains the generated protobuf code for the Trillian API.
github.com/google/trillian/client/rpcflagsPackage rpcflags defines flags for configuring RPC clients.
google.golang.org/genproto/protobuf/field_maskPackage field_mask aliases all exported identifiers in package "google.golang.org/protobuf/types/known/fieldmaskpb".
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/statusPackage status implements errors returned by gRPC.
google.golang.org/protobuf/encoding/prototextPackage prototext marshals and unmarshals protocol buffer messages as the textproto format.
google.golang.org/protobuf/reflect/protoreflectPackage protoreflect provides interfaces to dynamically manipulate messages.
google.golang.org/protobuf/reflect/protoregistryPackage protoregistry provides data structures to register and lookup protobuf descriptor types.
k8s.io/klog/v2Package klog contains the following functionality:
timePackage time provides functionality for measuring and displaying time.