* write common configuration facility

* run_all_releng (master script)
 + figure out how to efficiently search for interesting
   err/warn keywords spewed up by the script or apps it calls.

* releng_build_isojigdo:
 + finish boot options

* releng_check_isocontent (WIP) - compare input data against
  the ISO image content, might be tricky

* Interpreter to read options from config files and sets the variables