Improve signature collection script by adding configuration and actually collecting the valid sigs.
Improve signature collection script by adding configuration and actually
collecting the valid sigs.

* tools/dist/collect_sigs.py
  (): Import the configuration options.
  (save_valid_sig): New.
  (process_sig): Save the valid signatures.
  (main): Use the config options.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion