fix(contrib/coreos): bump timeouts for etcd and fleet

See discussion in https://github.com/deis/deis/issues/1688
A 4-5x factor of heartbeat interval to election timeout is suggested in https://github.com/coreos/etcd/blob/master/Documentation/tuning.md#time-parameters, so that would mean something like 400-500ms. This is actually going to slow down your write throughput, though, as connections hang open until a heartbeat succeeds. How about we go with 200ms for now?