style: remove psm in bootstrap_tpl.go (cloudwego#317)

* style: Replace 'PSM' with 'SERVICE_NAME' in bootstrap_tpl.go

* style: remove export `PSM`

Author: li-jin-gou

tool/internal/pkg/tpl/bootstrap_tpl.go

@@ -16,7 +16,6 @@ package tpl
 
 // BootstrapTpl is the template for generating bootstrap.sh.
 var BootstrapTpl = `#! /usr/bin/env bash
-export PSM=${PSM:-{{.RealServiceName}}}
 CURDIR=$(cd $(dirname $0); pwd)
 
 if [ "X$1" != "X" ]; then