I'm trying to impliment an automatic failover system, and am running into
the problem that when I try to start multiple postgres clusters on the
same box, postgres will not start if /tmp/.s.PGSQL.5432.lock exists. Can I
change the file it's looking for via an option? Nothing seemed obvious
from a quick review of the docs, short of (presumably) changing the port
number, which I don't want to do.
