Added support for using broadcast mode with heartbeat. Commit at https://github.com/giandvd/vyatta-cluster/commit/066af66cf2cce4a7882051de1c13eb3181535bf0.
Now you can do `set cluster mode brodcast` which will generate an /etc/heartbeat/ha.cf with:
`bcast [/cluster/interface]`
Default is multicast, as usual.