Fix: sbd-integration: sync pacemakerd with sbd
    
    Make pacemakerd wait to be pinged by sbd before starting
    sub-daemons. Pings further reply health-state and timestamp
    of last successful check. On shutdown bring down all the
    sub-daemons and wait to be polled for state by sbd before
    finally exiting pacemakerd.
    Add new api as not to make the xml-structure an external interface.