add back flag for kubernetes log level in CLI

[jessesuen]

Summary

We used to have a --gloglevel in argo cli which would translate to glog (now klog) levels. This was useful for debugging kubernetes payloads. It got removed somehow so we should add it back.

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[alexec]

Can I suggest we enable this with --loglevel DEBUG or -v? I did not know about this flag and I would have used it all the time if I did.

[alexec]

Caused by #2814?

[alexec]

	// global log level
	var logLevel string
	var glogLevel int
	var verbose bool
	command.PersistentPreRun = func(cmd *cobra.Command, args []string) {
		if verbose {
			logLevel = "debug"
			glogLevel = 9
		}
		cli.SetLogLevel(logLevel)
		cli.SetGLogLevel(glogLevel)
		log.WithField("version", argo.GetVersion()).Debug("CLI version")
	}
	command.PersistentFlags().StringVar(&logLevel, "loglevel", "info", "Set the logging level. One of: debug|info|warn|error")
	command.PersistentFlags().IntVar(&glogLevel, "gloglevel", 0, "Set the logging level. One of: debug|info|warn|error")
	command.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "Enabled verbose logging, i.e. --loglevel debug")

[alexec]

It got removed somehow so we should add it back.

Because there was not tests? ;)

[alexec]

Will come in v2.11.1