Fix setsebool log message with selinux disabled
    
    This is cosmetic fix, that's prevent execution of setsebool
    during ypbind service start when selinux is disabled.
    
    As a result invalid boolean message should not occur in logs anymore:
    
    systemd[1]: Starting NIS/YP (Network Information Service) Clients to NIS Domain Binder...
    setsebool[1581714]: Could not change active booleans: Invalid boolean
    
    Resolves: #1882069