data race between UntilInterrupted() and other threads

[ldemailly]

In fortio proxy for instance (when having the TLS server thread):

==================
WARNING: DATA RACE
Read at 0x00010108d5a4 by goroutine 8:
  fortio.org/log.colorGID()
      /Users/dl/go/pkg/mod/fortio.org/log@v1.17.1/console_logging.go:154 +0x40
  fortio.org/log.logUnconditionalf()
      /Users/dl/go/pkg/mod/fortio.org/log@v1.17.1/logger.go:469 +0x144
  fortio.org/log.logPrintf()
      /Users/dl/go/pkg/mod/fortio.org/log@v1.17.1/logger.go:436 +0x1c4
  fortio.org/log.Infof()
      /Users/dl/go/pkg/mod/fortio.org/log@v1.17.1/logger.go:532 +0x878
  main.startTLSProxy()
      /Users/dl/dev/fortio.org/proxy/proxy_main.go:135 +0x728
  main.main.gowrap1()
      /Users/dl/dev/fortio.org/proxy/proxy_main.go:110 +0x34

Previous write at 0x00010108d5a4 by main goroutine:
  fortio.org/cli.UntilInterrupted()
      /Users/dl/go/pkg/mod/fortio.org/cli@v1.9.2/cli.go:266 +0x40
  fortio.org/scli.UntilInterrupted()
      /Users/dl/go/pkg/mod/fortio.org/scli@v1.15.3/scli.go:132 +0xe44
  main.main()
      /Users/dl/dev/fortio.org/proxy/proxy_main.go:112 +0xe40

Goroutine 8 (running) created at:
  main.main()
      /Users/dl/dev/fortio.org/proxy/proxy_main.go:110 +0xe14
==================

[ldemailly]

will address in cli