Replace wait-for-network services with retries

assets/go-dnsclient.patch

@@ -0,0 +1,24 @@
+265,270d264
+< 	// Ensure only one update at a time checks resolv.conf.
+< 	if !conf.tryAcquireSema() {
+< 		return
+< 	}
+< 	defer conf.releaseSema()
+< 
+276a271,280
+> 	conf.update(name)
+> }
+> 
+> func (conf *resolverConfig) update(name string) {
+> 	// Ensure only one update at a time checks resolv.conf.
+> 	if !conf.tryAcquireSema() {
+> 		return
+> 	}
+> 	defer conf.releaseSema()
+> 
+293a298,302
+> }
+> 
+> func UpdateDnsConf() {
+> 	resolvConf.initOnce.Do(resolvConf.init)
+> 	resolvConf.update("/etc/resolv.conf")