message: [agent] refine booting logs
  Use `NOTE` log level instead of `INFO` since the log information is
  important.
diff: * POSSIBILITY OF SUCH DAMAGE.
  */
  +#define OTBR_LOG_TAG "AGENT"
  +
  #include <openthread-br/config.h>
  #include <fstream>
  @@ -117,19 +119,17 @@ static otbrLogLevel GetDefaultLogLevel(void)
  return level;
  }
  -static void PrintRadioVersion(otInstance *aInstance)
  -{
  - printf("%s\n", otPlatRadioGetVersionString(aInstance));
  -}
  -
  static void PrintRadioVersionAndExit(const std::vector<const char *> &aRadioUrls)
  {
  otbr::Ncp::ControllerOpenThread ncpOpenThread{/* aInterfaceName */ "", aRadioUrls, /* aBackboneInterfaceName */ "",
  /* aDryRun */ true};
  + const char * radioVersion;
  ncpOpenThread.Init();
  - PrintRadioVersion(ncpOpenThread.GetInstance());
  + radioVersion = otPlatRadioGetVersionString(ncpOpenThread.GetInstance());
  + otbrLogNotice("Radio version: %s", radioVersion);
  + printf("%s\n", radioVersion);
  ncpOpenThread.Deinit();
  @@ -192,14 +192,14 @@ static int realmain(int argc, char *argv[])
  }
  otbrLogInit(kSyslogIdent, logLevel, verbose);
  - otbrLogInfo("Running %s", OTBR_PACKAGE_VERSION);
  - otbrLogInfo("Thread version: %s", otbr::Ncp::ControllerOpenThread::GetThreadVersion());
  - otbrLogInfo("Thread interface: %s", interfaceName);
  - otbrLogInfo("Backbone interface: %s", backboneInterfaceName);
  + otbrLogNotice("Running %s", OTBR_PACKAGE_VERSION);
  + otbrLogNotice("Thread version: %s", otbr::Ncp::ControllerOpenThread::GetThreadVersion());
  + otbrLogNotice("Thread interface: %s", interfaceName);
  + otbrLogNotice("Backbone interface: %s", backboneInterfaceName);
  for (int i = optind; i < argc; i++)
  {
  - otbrLogInfo("Radio URL: %s", argv[i]);
  + otbrLogNotice("Radio URL: %s", argv[i]);
  radioUrls.push_back(argv[i]);
  }
  