generate-manifest-2.7.py: sync with python-2.7-manifest.inc

Some changes were made earlier by me to SUMMARY values in
python-2.7-manifest.inc without changing the manifest script.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>