cman: check for new config only once per second
    
    This patch fixes a condition where user calls cman_tool version
    multiple times where version is non existing multiple times.
    
    This will cause addition of many corosync_timers and new configuration
    is then tested every 1/(no. calls) sec, instead of (default) 1sec. If
    fraction is really small, corosync will keep reloading file using 100%
    CPU time and doing nothing else.
    
    Resolves: rhbz#616222