Block traffic during first connection.

Set up routes to UDP unlimited server (since openvpn hasn't finished, it
simply blocks traffic) and also DNS server to 10.41.0.1.

These values correspond to current leap_platform configuration (https://github.com/leapcode/leap_platform/blob/7bc79e68e5ca913d1d2843c48cde8f946feed09c/puppet/modules/site_openvpn/manifests/init.pp)