systemd: require networking to be up before starting the service.

rpm/SOURCES/nginx.service

diff --git a/rpm/SOURCES/nginx.service b/rpm/SOURCES/nginx.service
index ed8fb78..bd0e7d3 100644
--- a/rpm/SOURCES/nginx.service
+++ b/rpm/SOURCES/nginx.service
@@ -1,7 +1,8 @@
 [Unit]
 Description=nginx - high performance web server
 Documentation=http://nginx.org/en/docs/
-After=network.target remote-fs.target nss-lookup.target
+After=network-online.target remote-fs.target nss-lookup.target
+Wants=network-online.target
  
 [Service]
 Type=forking