Since corosync rules are now only created when a corosync.conf file is
present, a static corosync.conf has been added and will be loaded for
testing.
New test rules have been introduced to check corosync rules relating to
different rings/links.
Includes hostnames in config to trigger resolving codepaths.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>