Additional check for synchronization helpers, if HA was enabled

Additional check for synchronization helpers, if HA was enabled for service on node attaching to cluster

This fix bug 895780
https://bugzilla.novell.com/show_bug.cgi?id=895780
I think you should drop the `()` here - they are not needed.  Actually it might be more readable like this:

    return unless node[cookbook_name][:ha].nil? || node[cookbook_name][:ha][:enabled]