Use new corosync confdb API to remove string limit.
    
    The original corosync confdb API had a 256 byte limit on all
    value strings returned. A new API was added that did not have this
    restriction, and this commit cases (mainly) libccs and others to
    use it so those benefits can be passed down to other cluster
    services.
    
    This means that cluster will now only compile against
    corosync libraries that have the *_typed2 API calls.
    
    Resolves: rhbz#847234
    
    Signed-off-by: Christine Caulfield <ccaulfie@redhat.com>
    Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>