Make scap transport CDB files via JSON

* Added scripts to update CDB files without sending them.
* One script renames new, staged, CDB files over the current ones,
  while adding JSON diff and MD5 information in subdirectories.
* Another script uses the JSON and MD5 files to apply the changes
  to update CDB files.
* Scap will rebuild JSON files, sync them out, and have each server
  rebuild the CDB files. The rsync command excludes the l10n CDB files.

Change-Id: Ifcee784c9a86bd48e3715899b05dd368d8767ce7