rgmanager: fix cpglockd vs rgmanager startup race condition with systemd
    
    systemd consider a service fully operation as soon as /var/run/foo.pid is
    written.
    
    this creates a small window in which rgmanager can start before cpglockd
    is operational and rgmanager would fail.
    
    loop over cpglockdump to verify that cpglockd is functional and then
    start rgmanager
    
    Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
    Reviewed-by: Lon Hohberger <lhh@redhat.com>
    Reviewed-by: Ryan McCabe <rmccabe@redhat.com>