cluster create: use new corosync-link format for totem interfaces

cluster create: use new corosync-link format for totem interfaces

Preparation for enhanced compatibility with new corosync 3/knet
transport. Pretty straight forward switch from ringX_addr to links,
*but*, for configuration backward compatibility corosync still uses
"ringX_addr" as "link address", this will surely add confusion...

We drop all the "all IP versions must match" checking code, as
1. it could not cope with unresolved hostname's anyway
2. links can be on different IP versions with kronosnet

This makes it a bit easier and shorter, we can re-add some (saner)
checking always later on, if people misconfigure this often..

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>