message: Improve coverage for server/options_impl.cc
diff: @@ -83,6 +83,9 @@ TEST(OptionsImplTest, All) {
  EXPECT_EQ(std::chrono::seconds(60), options->drainTime());
  EXPECT_EQ(std::chrono::seconds(90), options->parentShutdownTime());
  EXPECT_EQ(true, options->hotRestartDisabled());
  +
  + options = createOptionsImpl("envoy --mode init_only");
  + EXPECT_EQ(Server::Mode::InitOnly, options->mode());
  }
  TEST(OptionsImplTest, SetAll) {
  