Add boolean flag 'show-secrets' to config sub command 'view'

this new flag is added to control the revealing of secrets for the
'crc config view' command, by default the flag is set to false and
keeps the secrets, secret.

this is only added to the 'view' sub command as for 'get' and 'set'
commands users have to also mention the config name and are  aware
that they are working with a secret config

for 'view' to reveal the secrets we'll need to pass '--show-secrets'
flag, 'crc config view --show-secrets'

cmd/crc/cmd/config/view.go

@@ -16,7 +16,10 @@ const (
 	DefaultConfigViewFormat = "- {{.ConfigKey | printf \"%-38s\"}}: {{.ConfigValue}}"
 )
 
-var configViewFormat string
+var (
+	configViewFormat string
+	showSecrets      bool
+)
 
 type configViewTemplate struct {
 	ConfigKey   string
@@ -38,6 +41,7 @@ func configViewCmd(config config.Storage) *cobra.Command {
 	}
 	configViewCmd.Flags().StringVar(&configViewFormat, "format", DefaultConfigViewFormat,
 		`Go template format to apply to the configuration file. For more information about Go templates, see: https://golang.org/pkg/text/template/`)
+	configViewCmd.Flags().BoolVar(&showSecrets, "show-secrets", false, "Show values of secret config properties")
 	return configViewCmd
 }
 
@@ -55,7 +59,7 @@ func runConfigView(cfg map[string]config.SettingValue, tmpl *template.Template,
 		if v.IsDefault {
 			continue
 		}
-		if v.IsSecret {
+		if v.IsSecret && !showSecrets {
 			continue
 		}
 		viewTmplt := configViewTemplate{k, v.AsString()}