feat: log all triggers called by golang in trace output

Trace mode is useful for shell code, but less so for golang. Adding debug logging in golang for trigger calls makes it a little easier to see what is happening.

plugins/common/subprocess.go

@@ -75,6 +75,7 @@ func (sc *ShellCmd) CombinedOutput() ([]byte, error) {
 
 // PlugnTrigger fire the given plugn trigger with the given args
 func PlugnTrigger(triggerName string, args ...string) error {
+	LogDebug(fmt.Sprintf("plugn trigger %s %v", triggerName, args))
 	return PlugnTriggerSetup(triggerName, args...).Run()
 }