recoverd: An inactive node should not force recovery master elections

recoverd: An inactive node should not force recovery master elections

An inactive node can't become the recovery master.  So if an inactive
node notices that the recovery master is inactive, it shouldn't force
an election for recovery master and nominate itself as a candidate.
This can cause the recovery master to flip-flop between nodes when all
nodes are inactive.

If there is actually an active node then it will trigger the election.

This is fairly cosmetic but is a step along the way towards ironing
out weirdness when all nodes are stopped.

Also, fix a related comment.

Signed-off-by: Martin Schwenke <martin@meltin.net>