Bump to placeholder release 1.17-3
    
    Here's a trick... We build 1.17-2.el6 (EPEL). It has local changes.
    If a mass-rebuild happens, someone may build another 1.17-2 and
    things may get confusing. So, bump to 1.17-3, in case. Do not build
    for now though, since there's no reason to update Rawhide.