vqsim: Fix vqsim for corosync 3.0

A couple of small internal changes in corosync 3.0 broke vqsim.

1. The way the custom config file is specified (no long an env variable)
2. votequorum now needs to know ouZ_node_pos

Signed-off-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>