MONITOR: Don't check for pidfile if SSSD is already running
    
    Related:
    https://pagure.io/SSSD/sssd/issue/3862
    
    The --genconf option of sssd is meant to be used to reload configuration from a
    systemd socket-activated service. But it would only work if sssd was not
    running, which defies its purpose.
    
    Reviewed-by: Michal Židek <mzidek@redhat.com>