Introduce candidate election timeout divisor

When a candidate is waiting for an election to occur, it is sometimes
preferable to shorten the timeout interval down, so that we do not
wait the full election timeout.

This patch introduces the knob which serves to divide the normal
timeout -- i.e. it can be halved.

Change-Id: Idbe81c39bf7aecf56b9f13a242bea89a1a4ac4f1
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>