main: replace manhole with gopreload

gopreload.go

@@ -0,0 +1,9 @@
+// gopreload.go
+package main
+
+/*
+   This file is separate to make it very easy to both add into an application, but
+   also very easy to remove.
+*/
+
+import _ "github.com/Xe/gopreload"

manhole.go

@@ -1,22 +0,0 @@
-package main
-
-import (
-	"log"
-	"net"
-	"net/http"
-	_ "net/http/pprof"
-	"net/rpc"
-)
-
-func init() {
-	l, err := net.Listen("tcp", "127.0.0.2:0")
-	if err != nil {
-		log.Printf("manhole: cannot bind to 127.0.0.2:0: %v", err)
-		return
-	}
-
-	log.Printf("manhole: Now listening on http://%s", l.Addr())
-
-	rpc.HandleHTTP()
-	go http.Serve(l, nil)
-}