resource-agents: Add NFSv4 support
    
    This patch allows the nfsserver agent to export
    NFSv4 and map recovery directories to places on
    shared file systems in order to allow v4 recovery
    to take place when the NFS daemons are started.
    
    Resolves: rhbz#595547
    
    Signed-off-by: Lon Hohberger <lhh@redhat.com>