Create pid file before runtime init, Fixes #1990

docker/rpmtest/Dockerfile

@@ -1,6 +0,0 @@
-FROM centos:latest
-
-RUN yum install -y initscripts
-
-ADD *.rpm /tmp/
-

main.go

@@ -49,8 +49,8 @@ func main() {
 
 	flag.Parse()
 
-	initRuntime()
 	writePIDFile()
+	initRuntime()
 
 	search.Init()
 	social.NewOAuthService()