This change makes the leader elector use a client that internally has
a smaller timeout than the renew deadline, which avoids a situation
where a single request timing out makes us lose the leader lease.

Signed-off-by: Vince Prignano <vince@prigna.com>

This change is a follow-up to the one that introduces the usage of the
leader-elector with client timeout. That change was breaking because it
introduces a new option and always assumed it was set. This change makes
us only use that option if its actually set.