rgmanager: Fix segfault on config reload
    
    This issue was initially triggered by rpm package which wrongly
    set executable flag on resource-script.metadata file in
    /usr/share/cluster/. After running "cman_tool version -r" cluster
    crashed, last log entry was:
    
      rgmanager[47960]: Loading Service Data
    
    Further investigation has shown, that this behaviour is triggered
    always if any runnable file in /usr/share/cluster provides output
    which is not well formed XML when run with the meta-data operation.
    
    This behaviour is probably caused by the wrong usage of
    xmlInitParser()/XmlCleanUp() parser.
    
    Resolves: rhbz#721004
    
    Signed-off-by: Yevheniy Demchenko <zheka@uvt.cz>
    Reviewed-by: Lon Hohberger <lhh@redhat.com>
    Reviewed-by: Fabio M. Di Nitto <fdinitto@redhat.com>
    Tested-by: Lon Hohberger <lhh@redhat.com>