Add an exec daemon plugin (#4424)

plugins/inputs/execd/examples/count.go

@@ -0,0 +1,24 @@
+package main
+
+// Example using HUP signaling
+
+import (
+	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+func main() {
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, syscall.SIGHUP)
+
+	counter := 0
+
+	for {
+		<-c
+
+		fmt.Printf("counter_go count=%d\n", counter)
+		counter++
+	}
+}