More metric tests and fix reconnect

* more metric test and fix reconnect

* remove build-devjmstest as dependency

vendor/github.com/prometheus/client_golang/examples/simple/main.go

@@ -16,16 +16,15 @@ package main
 
 import (
 	"flag"
-	"log"
 	"net/http"
 
-	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 var addr = flag.String("listen-address", ":8080", "The address to listen on for HTTP requests.")
 
 func main() {
 	flag.Parse()
-	http.Handle("/metrics", promhttp.Handler())
-	log.Fatal(http.ListenAndServe(*addr, nil))
+	http.Handle("/metrics", prometheus.Handler())
+	http.ListenAndServe(*addr, nil)
 }