Ensure net-fence executable is statically linked

Without this, net-fence fails to load with an obscure "not found" error.

The problem is that net-fence uses the Go net package and this causes
the executable to become dynamically linked.

See http://blog.xebia.com/2014/07/04/create-the-smallest-possible-docker-container/
more information.

Signed-off-by: Steve Powell <spowell@pivotal.io>
set mtu in container
split debug output at \n