import-ccd: Add support for continuing after incomplete run

import-ccd often asks about far more commits than I can handle in one
go, and sometimes I have to log out or otherwise kill it before it's
done.

It also sometimes fails for various reasons, and it should be possible
for me to fix up the problem and continue.

* Save the list of commits to a file
* Save the current position in the list to a file (after processing
  every patch)
* Delete these files when done
* If the list is present at startup, check that the target upstream
  commit matches and then continue from the previous position
1 file changed
tree: 4b796bba212f61c13497d2bc036b1dd7b8e63dc4
  1. config-3.2/
  2. queue-3.16/
  3. releases/
  4. scripts/
  5. .gitignore
  6. upstream-head