message: Move version strings from device string to platform init
  Reviewers: #tensorflow, georgep
diff: @@ -48,6 +48,7 @@ namespace poplarplugin {
  PoplarPlatform::PoplarPlatform() : name_("Poplar") {
  VLOG(1) << "Poplar version: " << poplar::versionString()
  + << " Poplar package: " << poplar::packageHash()
  << " Poplar Tensorflow version: " << tf_git_version() << ")";
  }
  @@ -115,13 +116,8 @@ StatusOr<std::unique_ptr<se::DeviceDescription>>
  PoplarPlatform::DescriptionForDevice(int ordinal) const {
  se::internal::DeviceDescriptionBuilder builder;
  - std::string tf_poplar_build_tag = TOSTRING(TF_POPLAR_BUILD_TAG);
  -
  builder.set_name("Poplar");
  - const auto version = poplar::versionString() +
  - " (Poplar package: " + poplar::packageHash() +
  - ") (Tensorflow package: " + tf_poplar_build_tag + ")";
  - builder.set_platform_version(version);
  + builder.set_platform_version("");
  return builder.Build();
  }
  