no connection block in client config

The android app **OpenVPN for Android** doen't supports `<connection>` blocks in the client configuration file. Because the generated config only use a single `remote` config I have removed the block.
I can confirm, [OpenVPN Connect](https://play.google.com/store/apps/details?id=net.openvpn.openvpn) can still import and connect with the clienet config without `<connection>`.

 * App: https://play.google.com/store/apps/details?id=de.blinkt.openvpn
 * Source: https://code.google.com/p/ics-openvpn/source/checkout (uses OpenVPN 2.3)