Enable etcd tweaks by default.

Created by: garloff

This keeps the etcd clusters stable even in somewhat awkward situations with network storage (or high steal time, though that does not seem to be as muh of a problem).

It's better to build stable 3/5/7 node clusters for the control plane and risk losing etcd updates when a node really crashes than not having stable clusters.

So let's default those tweak to be enabled.

Signed-off-by: Kurt Garloff kurt@garloff.de